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Mineralati

Minerals

Creedite

creedite

Ca3Al2(SO4)(OH)2F8·2H2O

Creedite Crystal Mineral Specimen - Celestial Earth Minerals

Creedite Crystal Mineral Specimen - Celestial Earth Minerals — via celestialearthminerals.com · Source

Overview

Creedite is a halide mineral with the chemical formula Ca3Al2SO4(F,OH)10·2(H2O). Creedite forms colorless to white to purple monoclinic prismatic crystals. It often occurs as acicular radiating sprays of fine prisms. It is translucent to transparent with indices of refraction of nα = 1.461, nβ = 1.478, nγ = 1.485. It has a Mohs hardness of 3.5 to 4 and a specific gravity of 2.7. Creedite was first described in 1916 from the Creede Quadrangle in Mineral County, Colorado. It is a product of intense oxidation of ore deposits.

Identification characteristics

  • Mohs hardness 4

Scientific references

  1. Creedite — Wikidata. https://www.wikidata.org/wiki/Q382754 Link
  2. Creedite — Wikipedia. https://en.wikipedia.org/wiki/Creedite Link