Picture pending, manganvoelckerite from Varuträsk.
| Mineral class | Phosphates : apatite group. | |
| Chemical formula | Mn,Ca5F(PO4)3 | |
| Crystal system | Hexagonal | |
| Habitus | Thick prismatic crystals or massive. | |
| Cleavage | ||
| Hardness | 5 | |
| Density | ||
| Color | Light blue. | |
| Streak | White. | |
| Luster | ||
| Description | A mangan apatite with less fluorine. The mangan
voelckerite is less resistant than mangan apatite against weathering, and is
typically showing small holes in the surface. The status of this mineral was under discussion in 1955, and I don't know the outcom of that discussion. | |
| Occurance | In pegmatites. | |
| Associates | Somtimes with a kernel of manganapatite. | |
| Notes | Soluble in hydrocloric acid, in sulphur acid and nitrous acid. The nitric acid solution gives with ammonium molybdate an yolk yellow precipitate. | |
| Locations |
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| To phosphates index. |
Mineral group index. |
Main index. |
If you have some questions, suggestions or comments you are welcome to write me a line or two.