AM-2015-02208-C · Tourmaline (schorl)archived
physical & structuralrev. 1
| designation | Tourmaline (schorl) |
|---|---|
| chemical formula | NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄ |
| classification | Cyclosilicate / Tourmaline group |
| crystal system | Trigonal |
| mohs hardness | 7 – 7.5 |
| density (g/cm³) | 3.18 |
| colour | Black |
| type locality | Erongo Mountains, Namibia |
raman spectroscopy532 nm · pass C
reported peaks (cm⁻¹): 220, 365, 711, 1063
notessubmitter remarks + registry
Prismatic crystals with striated faces.