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Rapidcreekite

Named after the Rapid Creek type locality in Yukon Territory, Canada. At thetype locality, Rapidcreekite, a secondary mineral, is “formed along joint and bedding-plane surfaces of quartz-rich sideritic iron formation.” According to mindat.org, Rapidcreekite has other localities in Germany, Norway, and Romania.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/rapidcreekite.pdf
- Formula
- Ca2(SO4)(CO3)·4H2O
- Crystal System
- Orthorhombic
- Crystal Habit
- Acicular
- Cleavage
- Perfect, Good, None
- Luster
- Vitreous (Glassy)
- Color
- colorless, white
- Streak
- white
- Class
- Orthorhombic - Dipyramidal
- Hardness
- 2
- WebMineral
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- Mindat
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Rapidcreekite from Rapid Creek, Yukon Territory, Canada

White radial crystal sprays to 2.5mm.
Rapidcreekite from Crosscut Creek, Rapid Creek, Yukon Territory, Canada
- Special Info
- Type Locality
Snow white sprays of Rapidcreekite to 2mm. Nice piece, usually hard to find on the market.