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Formula: Pb4(Al3Cu)(Si4O12)(S0.5Si0.5O4)(OH)7Cl(H2O)3
Cyclosilicate (ring silicate)
Crystal System: Orthorhombic
Specific gravity: 4.381 calculated for the empirical formula
Streak: White
Colour: Colourless to white
Luminescence: Does not fluoresce in either long wave or short wave UV
Solubility: Dissolves very slowly in concentrated hydrochloric acid; it is insoluble and unreactive in
concentrated sulphuric acid and 70% nitric acid.
Common impurities: F,Cr,(Ca)
Environments
Bobmeyerite was approved in 2012, but to date (June 2025) it has been reported only from the
type locality.
Localities
At the type locality, the Mammoth-Saint Anthony Mine, St. Anthony deposit, Tiger, Mammoth Mining District, Pinal
County, Arizona, USA, bobmeyerite occurs in an oxidation zone assemblage that includes
atacamite, caledonite,
cerussite, connellite,
diaboleite, fluorite,
georgerobinsonite,
hematite, leadhillite,
matlockite, murdochite,
phosgenite, pinalite,
quartz, wulfenite and
yedlinite. The mode of occurrence is attributed to progressive
alteration and crystallisation in a closed system
(MM 77.1.81-91).
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