Where is Satin Spar found?
Gypsum (variety: Satin Spar)
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Open the appSatin Spar 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 Satin Spar
United States
Significant deposits are found in states such as Oklahoma, Texas, New Mexico, and Utah, often in association with Permian-age evaporite sequences.
Canada
Nova Scotia and New Brunswick have notable gypsum deposits, including fibrous varieties.
Mexico
Extensive gypsum deposits, including satin spar, are found in various regions.
Europe
Spain, Italy, and the UK (e.g., Cumbria, Nottinghamshire) have historical and active gypsum mining operations that yield satin spar.
Australia
Found in evaporitic basins across the continent, particularly in arid and semi-arid regions.
Collecting tips
- Look for Evaporite Deposits. Satin spar is typically found in sedimentary rocks that formed in ancient seas or lakes that underwent significant evaporation. Look for areas with shales, limestones, and sandstones that might contain gypsum beds.
- Examine Veins and Fractures. Satin spar often occurs as vein fillings within other rocks. Look for white to translucent fibrous material filling cracks or fissures.
- Test Hardness. Gypsum is very soft (Mohs hardness 2). If you can scratch it easily with your fingernail, it's a good indicator. Be careful not to confuse it with harder fibrous minerals.
- Observe Luster. The characteristic silky or pearly luster is a key identifier. Rotate the specimen under light to observe the chatoyancy.
- Check for Cleavage. While fibrous, gypsum still exhibits perfect cleavage. You might be able to gently separate fibers or observe the cleavage planes on broken surfaces.
Quick Check
- Color:
- White to colorless, pale yellow, pink, or brown
- Luster:
- Silky to pearly
- Streak:
- White
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