Celestite Geode

$229.22
Chemical FormulaSrSO₄
Crystal SystemOrthorhombic
Mohs Hardness3–3.5
Specific Gravity3.97
LusterVitreous
TransparencyTransparent to translucent

Madagascar’s Sakoany district is the world’s top source for celestite — strontium sulfate in pale sky-blue crystals that earned the mineral its name (‘sky stone’ in Latin). Geodes …

6 in stock

SKU: TC-MIN-0034
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Description

What looks like stone is, on closer inspection, frozen time. Madagascar’s Sakoany district is the world’s top source for celestite — strontium sulfate in pale sky-blue crystals that earned the mineral its name (‘sky stone’ in Latin). Geodes here can reach 50 cm diameter, lined with tabular crystals that shimmer with a calming blue impossible to replicate in glass.

This specimen originates from Sakoany, Madagascar, one of the world’s most significant localities for this type of material. Collectors and scientists have drawn from this region for generations, and for good reason: the combination of geological conditions here produces specimens of exceptional quality and clarity.

Every specimen is unique. Photographs approximate the visual experience, but the real thing — its weight, its luster under a raking light, the way it catches the corner of your eye — can only be experienced directly.

Formation

This specimen formed through geological processes operating over timescales that dwarf human history. The specific combination of chemistry, temperature, pressure, and time at this locality produced material of exceptional quality that makes it a valued addition to any serious collection.

Locality

Celestite Geode from Sakoany, Madagascar. This locality is known for producing specimens of exceptional quality.

Collector Notes

Dust with a soft brush; avoid water for soft minerals (hardness below 4).