Where is Satin Spar Gypsum found?
Gypsum (CaSO4·2H2O)
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Open the appSatin Spar Gypsum 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 Gypsum
Naica Mine, Chihuahua, Mexico
Famous for its giant selenite crystals, but also produces excellent examples of satin spar.
Cave of the Crystals (Cueva de los Cristales), Naica, Mexico
While known for selenite, the broader Naica district yields various gypsum forms.
Utah, USA
Numerous localities, particularly in evaporite basins, produce satin spar.
New Mexico, USA
White Sands National Park is famous for its gypsum dunes, and satin spar can be found in associated deposits.
England
Historically significant localities, particularly in the Midlands, have yielded satin spar.
Canada
Various sedimentary basins across Canada contain gypsum deposits, including satin spar.
Collecting tips
- Look in Evaporite Deposits. Focus your search in areas known for ancient salt flats, dried lake beds, or sedimentary rock formations that indicate past evaporitic conditions.
- Check for Veins and Seams. Satin spar often forms in veins or seams within other sedimentary rocks, particularly shales and limestones. Look for linear features or infillings.
- Test for Softness. Gypsum is very soft (Mohs hardness 2). You should be able to scratch it easily with a fingernail. This helps distinguish it from harder fibrous minerals.
- Observe the Luster. The characteristic silky or satiny luster is a key identifier. Rotate the specimen under light to observe the play of light along the fibers.
- Handle with Care. Due to its softness and perfect cleavage, satin spar can be fragile. Handle specimens gently to avoid breakage or scratching.
Quick Check
- Color:
- White, colorless, pale yellow, pink, or brown
- Luster:
- Silky, pearly, satiny
- Streak:
- White
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