Crossite

Crossite
Crossite from California
General
CategoryAmphibole – Inosilicates
FormulaNa2(Mg,Fe)3(Al,Fe)2Si8O22(OH)2
Crystal systemMonoclinic
Identification
Colorblue, blue-green
Mohs scale hardness6
LusterVitreous
Streaklight blue
DiaphaneityTransparent to translucent
Specific gravity3.16
Optical propertiesBiaxial (-)

Crossite is an inosilicate double chain sodic amphibole and is a rare silicate mineral belonging to the riebeckite group. It is considered an intermediate between the amphiboles glaucophane and magnesioriebeckite, which form a series.[1] IMA status: discredited 1997.

Crossite is named after Charles Whitman Cross, an American USGS petrologist.

References

  1. ^ RIEBECKITE (Sodium Iron Magnesium Silicate Hydroxide)


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