Where is Green Selenite found?
Gypsum (variety Selenite)
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Open the appGreen Selenite 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 Green Selenite
Naica Mine, Chihuahua, Mexico
Famous for its giant selenite crystals, though green varieties are less common than clear ones, some inclusions can impart color.
Utah, USA
Various evaporite deposits can yield selenite, with some exhibiting green hues due to mineral inclusions.
Morocco
Known for various gypsum forms, including 'desert roses' which can sometimes have green tints.
Australia
Evaporite basins, particularly in arid regions, can host selenite deposits, some with color variations.
Collecting tips
- Look for Evaporite Environments. Focus on areas with ancient or modern evaporite deposits, such as dried lake beds, sabkhas, and sedimentary rock formations that indicate past marine or lacustrine environments.
- Check for Associated Minerals. Green Selenite often forms alongside other evaporite minerals like halite, anhydrite, and other gypsum varieties. The presence of copper-bearing minerals or iron silicates in the surrounding rock might indicate the potential for green coloration.
- Observe Crystal Habits. Selenite typically forms distinct crystals. Look for transparent to translucent, often tabular or prismatic crystals, or fibrous masses. The green color will be an additional distinguishing feature.
- Test Hardness and Cleavage. Gypsum is very soft (Mohs 2) and can be scratched with a fingernail. Its perfect cleavage allows it to be split into thin, flexible sheets, which is a key diagnostic test.
Quick Check
- Color:
- Pale to deep green
- Luster:
- Vitreous to pearly
- Streak:
- White
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