Sarcopside

minerals

beusite

triphylite

graftonite

Images
Formula: Fe2+3(PO4)2
Anhydrous normal phosphate, sarcopside group
Specific gravity: 3.64 to 3.73
Hardness: 4
Streak: White
Colour: Grey-pink, red-brown, brown (slightly altered), blue, lavender, green; flesh-red in transmitted light, rarely white.
Environments

Pegmatites

Sarcopside is formed in complex zoned granite pegmatites, along with graftonite, probably by exsolution from triphylite. Associated minerals include graftonite, vivianite, hureaulite and triphylite (HOM).

Localities

At the type locality, the Michałkowa pegmatites, Gmina Świdnica, Świdnica County, Lower Silesian Voivodeship, Poland, sarcopside occurs in a granite pegmatite, intergrown with graftonite, with hureaulite and vivianite as later products (Dana). Quartz, muscovite and microcline are also present (Mindat).

At Gingrass farm, near Deering, New Hampshite, USA, sarcopside occurs in a pegmatite lens in gneiss (Dana).

At the French King Number 2 quarry, East Alstead, New Hampshire, USA, sarcopside occurs in a pegmatite. The core was composed of a sarcopside-graftonite intergrowth penetrated by veins of vivianite and associated pyrite. Vivianite appears to be commonly associated with sarcopside (AM 50.1698-1707) At the Bull Moose Quarry, Custer, South Dakota, sarcopside occurs with triphylite, probably formed by exsolution; graftonite-sarcopside intergrowths are also found here, as well as specimens showing the expected coexistence of all three phases (AM 54 969-972).

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