Coquimbite

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 (MFA)

Raman (RRUFF)

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

• Web Minerals: Coquimbite

• Mindat at http://www.mindat.org/min-1126.html

• Website: http://labs.sci.qut.edu.au/minerals/mineral%20general%20descriptions/C/coquimbitepcd.htm