Melilite

sorosilicate

gehlenite

The melilite group is a group of tetragonal sorosilicates (Si2O7 groups). The most abundant members of the group are minerals in the åkermanite-gehlenite series
Formulae
Åkermanite: Ca2MgSi2O7
Gehlenite: Ca2Al(SiAl)O7
Melilite is a common component of magnesium-bearing skarn, and it also may be found in granite. It has been reported in a lamprophyre dike at Cripple Creek, Colorado, USA (MinRec 36.2.174).
quartz never occurs with melilite.

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