Mineral
Selenite / Gypsum
Gypsum (CaSO4·2H2O)
Hardness: 2 (can be scratched by a fingernail). Color: Colorless to white, often transparent to translucent. Luster: Pearly to vitreous. Crystal structure: Monoclinic, often forms tabular or prismatic crystals. Cleavage: Perfect on one plane.
- Hardness
- 2 (can be scratched by a fingernail)
- Color
- Colorless to white, often transparent to translucent
- Luster
- Pearly to vitreous
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Physical properties
Hardness: 2 (can be scratched by a fingernail). Color: Colorless to white, often transparent to translucent. Luster: Pearly to vitreous. Crystal structure: Monoclinic, often forms tabular or prismatic crystals. Cleavage: Perfect on one plane.
Formation & geological history
Formed as an evaporite mineral in ancient seabeds and salt lakes. Occurs in sedimentary environments.
Uses & applications
Used in the production of plaster of Paris, wallboard (drywall), and cement. Also popular among collectors and used in holistic practices.
Geological facts
Selenite is a variety of gypsum known for its transparent, colorless crystals. It is named after Selene, the Greek goddess of the moon, due to its moon-like glow.
Field identification & locations
Can be identified by its low hardness (easily scratched by a fingernail) and distinct cleavage. Commonly found in sedimentary deposits worldwide.
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Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
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Biotite Schist
Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]
metamorphic