AM-2009-00171-A · Quartz, var. smokyarchived
physical & structuralrev. 2
| designation | Quartz, var. smoky |
|---|---|
| chemical formula | SiO₂ |
| classification | Tectosilicate / Quartz group |
| crystal system | Trigonal |
| mohs hardness | 7 |
| density (g/cm³) | 2.65 |
| colour | Smoky brown to near-black |
| type locality | Cairngorm Mountains, Scotland |
raman spectroscopy532 nm · pass A
reported peaks (cm⁻¹): 128, 206, 464
notessubmitter remarks + registry
Coloration attributed to natural irradiation of structural Al impurities. Specimen photograph (orig.) not retained.