Mineralpedia Details for Macquartite

Named after the French chemist Louis Charles Henri Macquart who brought the Russian specimens of crocoite from which chromium was discovered to France. Macquartite is found in only one locality at the Mammoth-St. Anthony mine in Tiger, Arizona in the United States. It occurs on museum specimens from an oxidized lead-copper-zinc orebody.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/macquartite.pdf

Formula

Cu₂Pb₇(CrO₄)₄(SiO₄)₂(OH)₂ 

Crystal System

Monoclinic 

Crystal Habit

Euhedral Crystals 

Cleavage

Good, None, None 

Luster

Adamantine 

Color

orange 

Streak

light orange 

Class

Monoclinic - Prismatic 

Hardness

3.5 

WebMineral

View Macquartite 

Mindat

View Macquartite 

Yellow acicular sprays to 0.75mm. Joe Ruiz collection.