Muirite

muirite

sanbornite

pellyite

fresnoite

Images

Formula: Ba₁₀Ca₂Mn²⁺TiSi₁₀O₃₀(OH,Cl,F)₁₀
Cyclosilicate (ring silicate), barium-bearing mineral
Crystal System: Tetragonal
Specific gravity: 3.86 measured, 3.88 calculated
Hardness: 2½
Streak: Light orange
Colour: Orange
Solubility: Decomposed by dilute hydrochloric and nitric acids. Loses its colour and disintegrates to a white or colourless residue. Not affected by sulphuric acid, acetic acid, or concentrated sodium hydroxide (Mindat).
Common impurities: Al,Fe,Mg,Sr,K,H₂O
Environments

Metamorphic environments

Localities

At the Gun claim, Wilson Lake, Itsi Mountain, Watson Lake mining district, Yukon, Canada, muirite occurs as large grains to several cm in sanbornite. Associated minerals include hedenbergite, fresnoite, uvarovite, gillespite, taramellite, pellyite and baryte, as well as sanbornite (HOM, Dana).

At the type locality, the Esquire No. 7 claim, Big Creek, Rush Creek deposit, Big Creek-Rush Creek Mining District, Fresno county, California, USA, muirite occurs in metasediments surrounded by quartz diorite, in sanbornite-quartz bearing metamorphic rock. Associated minerals include sanbornite and verplanckite (HOM, Dana).

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