Where is Selenite found?
Gypsum variety (CaSO4·2H2O)
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Open the appSelenite occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Selenite
Naica Mine, Chihuahua, Mexico
Famous for its 'Cave of Crystals' containing enormous selenite crystals, some over 10 meters long.
Great Salt Plains State Park, Oklahoma, USA
Known for its unique hourglass-shaped selenite crystals found in the salt flats.
Coober Pedy, South Australia
Selenite crystals are often found in association with opal deposits.
Various locations in Spain
Significant deposits of selenite, including large transparent crystals, are found in several regions.
Utah, USA
Selenite is found in various evaporite deposits across the state.
Collecting tips
- Look in Evaporite Environments. Search in areas with a history of ancient seas, salt lakes, or playas. Dry lake beds and arid regions are prime locations.
- Check Cave Systems. Selenite can form beautiful 'gypsum flowers' or delicate crystals in caves, often as secondary deposits.
- Examine Sedimentary Rocks. Look for selenite crystals within shales, limestones, and other sedimentary layers, particularly those associated with evaporites.
- Handle with Care. Selenite is very soft (Mohs 2) and can be easily scratched or dissolved by water. Collect specimens carefully and protect them from abrasion and moisture.
- Distinguish from Calcite. While both can be transparent and have good cleavage, selenite is much softer (scratches with a fingernail) and does not effervesce with dilute hydrochloric acid, unlike calcite.
Quick Check
- Color:
- Colorless to white
- Luster:
- Vitreous to pearly
- Streak:
- White
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