Formula: Cu5Si6O17.7H2O
Tectosilicate (framework silicate) There are indications that a sharp loss of water occurs at
about 92oC (AM 65.1065).
Specific gravity: 2.82
Hardness: 2
Streak: Light green
Colour: Green to blue-green
Common impurities: Mn,Mg,Ca
Environments:
Gilalite is a retrograde metamorphic or mesogene mineral
formed at the expense of a prograde calc-silicate and
sulphide assemblage, commonly encrusting fractures in
garnet-diopside
skarn. It is also found filling cracks or interstices in
diopside grains. At the type locality, The Christmas mine, Arizona, USA, it
is associated with kinoite, apachite,
stringhamite, junitoite,
clinohedrite, xonotlite,
diopside, apophyllite,
calcite and tobermorite
(HOM).
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