AM-2017-10012-A · 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) | 3.14 |
| colour | Black |
| type locality | Shigar valley, Gilgit-Baltistan, Pakistan |
raman spectroscopy532 nm · pass A
reported peaks (cm⁻¹): 364, 709, 1064
notessubmitter remarks + registry
Standard tourmaline (schorl) reference specimen. Supplied as a single piece on a small fragment of host matrix.