Coquimbite

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Coquimbite

Description

Coquimbite at 100x (visible light left; UV light right)

A yellowish brown to violet hydrated iron sulfate mineral. Coquimbite was named after the province of Coquimbo in Chile where it was first described in 1841.

Synonyms and Related Terms

coquimbit; coquimbita

XRF

Slide4 coquimbite.PNG


Physical and Chemical Properties

  • Crystal structure is massive or granular, but may occur in plates or prisms.
  • Fracture = uneven
  • Cleavage = imperfect
  • Luster = vitreous
  • Streak = white
Composition Fe2(SO4)3.9H2O
Mohs Hardness 2.5
Density 2.0-2.1 g/ml
Molecular Weight 562.02
Refractive Index 1.55; 1.557

Resources and Citations