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Polished Septarian

Concretions lifted from Madagascar, sawn and hand polished into eggs, flame freeforms, points and open druzy geode halves.

Hand Polished Septarian From Madagascar, Sold by the Piece in Egg, Flame, Point and Geode Cuts

Septarian is a fossil mud concretion whose interior cracked as it dewatered on an ancient sea floor and then healed, filling those septaria with yellow calcite while brown aragonite lined the walls and clear barite crystallised in the last spaces. Astro Gallery of Gems buys these nodules in Madagascar, has each one sawn and hand polished rather than tumbled, then weighs and photographs the finished piece, so the 59 pieces here differ from one another in pattern, weight and cut.

Which Cut Fits: Egg, Flame, Point or Druzy Geode Half?

Septarian reaches this catalogue in four worked shapes, and the shape rather than the species usually decides the purchase. A cutter reads the crack pattern in the raw nodule first, then picks the form that puts the widest calcite veining on the face a buyer will actually look at.

Worked shapeWhat it does and who takes it home
Polished eggEggs run from under one hundred grams to three inches tall, arrive on an acrylic stand, and carry most of the gift buying because the curve wraps veining right around the piece.
Flame freeformFlames stand upright with a rippled edge left by the cutter, weigh between one and two pounds, and read as sculpture on a shelf rather than as a specimen in a case.
Polished pointPoints near six and a half inches tall taper to a tip and lift the calcite veining vertically, which suits a desk or a console beside taller objects.
Druzy geode halfGeode pieces open one face to quartz druzy and polish the back, reach eighteen pounds, and want a cleared surface with a light aimed into the crystal pocket.

What Does Polished Septarian Cost Today?

Weight, vein contrast and whether a druzy pocket opened at the saw account for almost the whole spread in the table below. Astro Gallery prices each nodule at gallery rate against its own figure, and a row leaves this table the moment that piece sells.

PieceDetailPrice
Polished Septarian Egg from Madagascar (89 grams) 89 grams $ 39.99
Genuine Polished Septarian (2.75") Egg from Madagascar 2.75" $ 79.99
Genuine Polished Septarian Egg (3") from Madagascar (297.5 grams) 297.5 grams $ 79.00
Polished Septarian Druzy Geode Egg from Madagascar (18 lbs) 18 lbs $ 1,350.00
Polished Septarian Flame Freeform from Madagascar (2.1 lbs) 2.1 lbs $ 260.00
Polished Septarian Flame Freeform from Madagascar (1.2 lbs) 1.2 lbs $ 150.00
No two nodules crack the same wayEach piece is photographed from the face and the base, so the veining, the weight and the stand you see belong to that nodule.
View all 59 pieces Request photographs

What Is Actually Inside a Madagascan Septarian Nodule?

A polished face shows four minerals at once, and knowing which is which explains both the pattern and the care the piece needs. Astro Gallery buys this material out of the Mahajanga basin in northwest Madagascar and names every component in the description.

Yellow calcite in the septariaCalcite fills the shrinkage cracks that give the stone its name, arriving as honey to lemon veining that dominates a polished face. Calcite measures Mohs 3 and dissolves in weak acid, which sets the handling limit for the whole piece.
Brown aragonite liningsAragonite, the orthorhombic polymorph of calcium carbonate, lines the crack walls in warm brown and separates each yellow vein from the grey body. Two nodules of equal weight often differ in price on that contrast alone.
Grey limestone bodyThe host is a fine grained grey limestone, the compacted lime mud that gathered around organic material on a shallow sea floor. It takes a softer sheen than calcite, so a well finished face shows two distinct levels of gloss.
Barite and quartz druzyClear to white barite, a barium sulphate dense enough to feel wrong in the hand, crystallised in the space calcite left behind. Where silica reached the cavity instead, quartz druzy lines it and the cutter leaves that pocket unpolished.

Polished Face or Natural Back: Which Side Are You Buying?

Worked on every surfaceEggs, points and flame freeforms are polished all the way round, so the calcite veining continues behind the piece and the object reads the same from any approach. That finish suits a gift, an open shelf and any position where nobody controls the viewing angle.
One polished face, one natural backGeode halves and sawn nodules take a mirror on the front and keep the reverse exactly as it came out of the ground, rind, matrix and open druzy pocket included. That piece wants a bookcase, a niche or a stand that fixes the front.

How Heavy Is the Piece You Want?

Weight bandWhat that weight buys
Under one hundred gramsSmall polished eggs sit in a closed hand, post easily inside a padded box, and account for the entry pricing across this collection.
Roughly three hundred grams to one poundThree inch eggs supplied with acrylic stands work on a bedside table or a desk and show a full crack pattern across the face.
One to two and a half poundsFlame freeforms and hand polished points occupy this band and behave as sculpture, holding a shelf without needing a group around them.
Fifteen pounds and aboveDruzy geode eggs anchor a console or a low table, and their weight demands a surface that will not flex under a single contact point.

Which Faults Should You Rule Out Before Paying?

Septarian is soft, so the real risks are chips and repairs rather than imitation. Astro Gallery photographs the base, the tip and every recess under raking light, which settles all four checks before money moves.

Chipping along the calcite veinsCalcite at Mohs 3 bruises where a vein reaches an edge, and a chip reads as a bright white notch against the yellow. Study the rim of an egg and the tip of a point, because a knock finds those surfaces first.
Fill and repair across a breakA repaired break returns a dull line where polish stops and resin begins, and it catches light differently from the stone around it. Astro Gallery states any repair in the description instead of leaving the seam for you to find.
Polish reaching into the recessesA rushed piece is bright on the open face and matt where veining dips into a hollow. Travel a light across the surface at a shallow angle, and the recesses should return the same gloss as the flat.
Base flatness and stand fitAn egg that rolls or a point that leans was ground off square at the base. Astro Gallery stands each piece on a level surface before listing it and supplies the acrylic stand wherever the form needs one.

Six Words That Appear on a Septarian Listing

ConcretionA hard mass that grew outward in soft sediment around a nucleus, which is how a septarian nodule formed before anything cracked inside it.
SeptariaThe radiating shrinkage cracks that opened as the concretion dried, later filled with calcite, and the feature the whole material takes its name from.
AragoniteA calcium carbonate polymorph sharing calcite chemistry but not its lattice, appearing here as the brown lining between yellow vein and grey host.
BariteBarium sulphate, clear to white and noticeably heavy for its size, which crystallised last in the cavities calcite had not already filled.
DruzyA carpet of small quartz crystals lining an open pocket, left unpolished by the cutter so each crystal face keeps its own sparkle.
Flame freeformAn upright cut with a rippled top edge, shaped to follow the nodule rather than a template, and finished on every surface.

Who Buys Septarian, and What Do They Call It?

Septarian sells hardest as a gift, because a polished egg carries visible geology, its own stand and no fragility beyond ordinary care. Interior buyers use the same material differently, standing a flame freeform against pale plaster where yellow veining reads across a room, or grouping graded eggs on a shelf where warm browns soften cold tile and glass.

Crystal buyers call this material dragon stone, after the way yellow veining cracks across a brown body like scales, and they associate it with calm, patience and clear speech in a group. Astro Gallery uses that name alongside septarian so both searches land on the same nodule, records mineralogy, weight and locality on every listing, and makes no health or healing claim.

Why Does Septarian Need Dry Cleaning Only?

Every mineral inside a septarian nodule is a carbonate or a sulphate, and none of them passes Mohs 4. Calcite dissolves in vinegar, lemon juice and most bathroom sprays, while ordinary hard water leaves a film that dulls the yellow veining within weeks. Dust each piece dry with a soft brush, work the bristles into the recesses a cloth cannot reach, and keep the polished face out of long direct sun so the browns hold their depth. A dropped egg chips rather than bounces, so stand it where a surface has a lip or a felt pad.

How Is a Septarian Order Paid For and Delivered?

The figure on the listing is the figure charged at checkout, which settles through Shop Pay, PayPal, Apple Pay, Google Pay or a Visa, Mastercard, Discover or Diners Club card against an itemised invoice. Ask for the height in inches, an image of the base, or a close photograph of the druzy pocket before you commit, and a member of our team replies before the day is out.

Astro Gallery of Gems has moved soft carbonate material through its New York gallery since 1961, and septarian is handled as fragile from the moment it leaves the case. We wrap the polished face first, pack the acrylic stand apart from the piece so it cannot press against the calcite, and seat anything past a pound inside a second carton with the insured value written on the paperwork. Each parcel leaves under tracking and full cover to any destination, with the customs declaration prepared beforehand, and the eighteen pound geode eggs are quoted for freight and approved by you ahead of dispatch. Our returns policy and the guarantee on about us cover the piece from the case to your door.

Rated everywhere we trade

4.6★849 reviews 99.5%138,000 sold 4.7★404 reviews 4.5★126 ratings #128of 1,994 4.1★119 reviews
See the veining before you decideTell us the shelf you are filling and we will photograph the face, the back and the base of any nodule that fits it.
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Eight Questions Buyers Send About This Material

How much does a polished septarian piece cost?
Small eggs at gram weights open the range, flame freeforms and points occupy the middle band, and the large druzy geode eggs sit at the top. Every row above updates straight from the catalogue, so the figure beside a nodule is what that nodule costs today.
Is septarian a natural stone or a man made composite?
Septarian is a natural concretion that formed on a sea floor, and every piece here was sawn and hand polished from one nodule. Astro Gallery names the calcite, aragonite, limestone and barite in each description and discloses any repair.
Is dragon stone the same thing as septarian?
Yes. Crystal sellers use dragon stone for the same Madagascan nodules that mineral dealers call septarian, and the name refers to the yellow veining that cracks across the brown body. We use both terms so either search reaches the correct piece.
Does a septarian egg arrive with a stand?
The polished eggs in this collection ship with an acrylic display stand included in the price, and the description confirms it on each product page. Flames and points stand unaided because the cutter grinds a flat base into them.
Why is one side of my septarian rough and unpolished?
Geode halves and sawn nodules keep a natural back on purpose, showing the rind and matrix the piece grew in. That reverse face is geology rather than an unfinished surface, and the listing photographs both sides before you order.
Can septarian get wet or live in a bathroom?
No. Calcite and aragonite are carbonates that react with acid and mark under hard water, so steam and splashing will dull the polish. Dust these pieces dry with a soft brush and keep cleaning sprays away from them entirely.
Which size works best as a gift?
Eggs between one hundred and three hundred grams suit gifting, since they arrive on a stand, fit a padded box and show a complete crack pattern. Flame freeforms around one pound work when the gift needs more presence on a shelf.
How do you ship an eighteen pound geode egg, and can I send it back?
Heavy geode eggs go out double cartoned as freight, quoted and approved by you before the order is placed, and insured for the full declared value. Anything sent back travels under the conditions printed on our returns page.

Where Septarian Sits Among the Polished Stones

Same shapes, other species
Polished eggsPointsPolished heartsSpheresPalm stones
Sedimentary and fossil relatives
FossilsPetrified woodGeodesCalcite
Other Madagascan material
JasperAgateAfrican minerals
Gifting and decorating
GiftsHome decorStone carvings
Before you order
Shipping and returnsAbout Astro GalleryMineral specimens