Mineral Name
Chemical Formula
X3Y2(SiO4)3
Preview
![image preview](https://ecommons.udayton.edu/geo_mineral/1006/preview.jpg)
Color
occurs in all colors, most commonly red, borwn, yellow, white, green, black
Class
Article
Luster
vitreous to resinous
Diaphaneity
transparent to translucent
Hardness
6.5-7.5
Cleavage
indistinct
Fracture
conchoidal to uneven
Density
3.5-4.3
Crystal Shape
common form is dodecahedron and trapezohedron
Crystal System
Isometric
COinS
Comments
X most often represents Ca, Fe2+, Mn, or Mg; Y most often represents Al, Cr, or Fe3+