|
Hard- ness |
Cleavage |
Fracture |
Trans- parency |
10% HCl Reaction |
SG |
Luster |
Color |
Streak |
Xtal Form |
Mineral Class |
Comments | herderite | 5.00 | parallel | conchoidal | Transparent | none | 2.90 | glassy | yellow | white | prismatic | phosphates | Variable color--white, yellow, greenish-white or purple. Occurs in granite pegmatites. |
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