Dragon Stone
Septaria egg of Madagascar
Septaria Madagascar egg
Also known as Dragon Stone
Septaria is a stone composed of a mixture of yellow calcite and sandstone, found mainly on the island of Madagascar, characterized by highly visible shrinkage cracks. These highly visible cracks, known as Septa, fill with minerals over time.
When the stone is polished, these cracks stand out, giving it a dragon's egg appearance on the outside.
With time, tectonic movements, etc., the nodules can be fractured and new mineral solutions can invade the shrinkage cracks, often calcite.
In our case, Septaria has been polished into an egg shape and the interior has been invaded by a very fine crystallization of calcite. Beautiful crystals.
It's also easy to see why it's called Dragon's Stone: the exterior is very similar to a dragon's egg!
Sold without base
Ref OSM55: Weight: 4.1kg - Height: 20cm
Sold without the base
You can find available bases by typing ball base or egg base in the site search.
High base specially designed to hold a ball or egg
Perfect for ostrich eggs
Not suitable for emu, rhea or swan eggs, for example
display for ball or egg (small)
Material: Resin material
display for crystal ball or ostrich egg
Not suitable for emu or swan eggs.
Wooden base for ball or sphere - Base - support
Grey-Black patinated marble base for ball or sphere
Base - support
Pair of ebonite medical cannulas in their original cardboard box
Circa 1920–1930
Original stock from that period
Man - Anatomical chart that can be disassembled
By Fernand Nathan Editeur publisher
Coloured chart with movable, cut-out and superimposed leaves
There are defects on the superimposed boards; the outer board, which was the man's torso, is missing, as are the lungs, which were above the heart. The left hand is missing, the arm being torn.
Painted papier-mâché anatomical model of the brain
Produced by Établissements Auzoux
Model No. 12 from the 1874 catalogue
Dismantlable, numbered model, used for medical teaching.
A rare item in excellent working condition
This is a 1:1 scale model of the brain, sold separately at the time as a demonstration model; it is not a brain that was found inside anatomical manikins.
Genuine spiral-carved marlin rostrum
Istiophoridae
Dimensions: H47cm
Antique bezoar - Antipoison - Antidote
Once sold by the apothecary, bezoar, also known as gallstone, was reputed to have the same anti-poison properties as the legendary unicorn's horn, hence its excessively high price, also due to its great rarity.
An important piece in a cabinet of curiosities
Sold alone - Without stand, sold separately
Wall decoration of Pompeii - Herculaneum mosaics: Chromolithographic plate
By Wilhelm Zahn
Published between 1832 and 1849
YOU ARE PURCHASING 1 SINGLE BOARD - NOT THE BOOK OR THE SET OF BOARDS
Entomological box
Composition with South American butterflies
Morpho and heliconius
Stiassnie Microscope
Lacquered Brass Precision Microscope – M. Stiassnie, Paris, c. 1905/1908
In its mahogany case – Serial Number: 11765
Research microscope configuration with 3 objectives (including a 1/12 oil immersion objective), micrometric stage and Abbe condenser.
A rare collector’s item combining mechanical precision and Parisian scientific prestige.
Entomological composition of beetles
28 specimens make up this picture
Black entomological box: 26x39cm
Carved swordfish rostrum: Unique piece
Skulls motifs
Indonesian craftsmanship
Flight of butterflies: Heliconius family under glass dome
Butterfly - Natural History color plate
Entomology
You buy 1 plate, not the whole set
Celestine Egg - Mineral WITH base
Origin: Madagascar
Be careful to protect it from water, which alters it: it dissolves or cracks on contact!
Sold with base
Genuine spiral-carved marlin rostrum
Istiophoridae
Dimensions: H52.5cm
Dragon Stone
Septaria egg of Madagascar
