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Formula: CaZn2Si2O7.H2O
Sorosilicate (Si2O7 groups)
Crystal System: Orthorhombic
Specific gravity: 3.5 measured, 3.506 calculated
Hardness: 4½
Streak: Colourless
Colour: Colourless to milky white
Environments
At the type locality, the Christmas mine, Gila county, Arizona, USA, junitoite occurs in a retrogressively altered
skarn,
with its occurrence closely related to the breakdown of
sphalerite in the ores
(AM61.1255-1258).
It is associated with
kinoite,
apophyllite, tyrolite,
sphalerite, clay minerals,
calcite, and
xonotlite
(Dana, Mindat, HOM).
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