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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
Hardystonite is another group member.
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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