Fluoro-richterite

Fluororichterite
Fluororichterite with calcite from Wilberforce, Monmouth Township, Haliburton County, Ontario, Canada (size: 6.6 x 4.4 x 3.8 cm)
General
CategorySilicate mineral
FormulaNa(NaCa)Mg5Si8O22F2
IMA symbolFlrct
Strunz classification9.DE.20
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupC2/m
Unit cella = 9.763, b = 17.89
c = 5.122 [Å]; β = 102.25°; Z = 2
Identification
ColorBrown to brownish-red, rose-red, yellow, grey-brown, also pale to dark green
Mohs scale hardness5–6
LusterVitreous
StreakWhite
Specific gravity3.17
References

Fluororichterite is a rare amphibole with formula Na(NaCa)Mg5Si8O22F2.

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