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Formula: Ca2Fe3+Sn(Si2O7)(Si2O6OH)
Sorosilicate (Si2O7 groups), kristiansenite group
Crystal System: Triclinic
Specific gravity: 3.737 calculated
Hardness: 6
Colour: Colourless to rarely greenish grey
Environments
Pegmatites
Metamorphic environments
Localities
At the type locality, the Szklarska Poręba Huta granite quarry, Szklarska Poręba, Karkonosze County, Lower Silesian
Voivodeship, Poland, microscopic mixed
kristiansenite-silesiaite crystals have been found in the
granitic
pegmatite. Associated Minerals include
zircon, quartz,
pyrite, malayaite,
kristiansenite,
kozłowskiite,
fergusonite-(Y),
clinochlore, chalcopyrite,
cassiterite, bismuthinite,
andradite, allanite-(Ce) and
albite
(Mindat).
At the Boinás west skarn, El Valle-Boinás Mine, Belmonte de Miranda, Asturias, Spain, silesiaite occurs in
calcic copper-gold
skarn. Associated minerals include
andradite, clinopyroxene,
actinolite,
hydroxyapophyllite-(K),
babingtonite, hydroandradite,
quartz, calcite and
chalcopyrite
(HOM).
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