Macquartite
Macquartite is an IMA-recognized mineral species in the silicate class, with the chemical formula Cu₂Pb₇(CrO₄)₄(SiO₄)₂(OH)₂.
It crystallizes in the monoclinic crystal system.
Key properties: Mohs hardness 3.5; specific gravity 5.49; Pale orange streak; optically biaxial.
IMA symbol Mcq, IMA status: approved, named in 1979.
On museum specimens from an oxidized Pb-Zn-Cu orebody.
It is found associated with Dioptase, quartz, willemite, wulfenite, chrysocolla, hematite, fluorite, barite.
The name refers to the French chemist Louis Charles Henri Macquart (1745–1808), who brought to France the Russian crocoite specimens in which chromium was discovered.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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