Formula: (Fe,Mg)2(Fe,Sn)BO5
Origin of name: For A. Hulse Brooks, American geologist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Black
Diaphaneity:
Luster: Submetallic to vitreous
Habit: Crystals rectangular, uneven faces, small; tabular masses
Hardness: ~ 3
Specific gravity: 4.5 to 4.62
Cleavage: 1; {110} good
Tenacity:
Streak:
Synonyms/varieties:
Comments:
| Back to Alphabetical list | Colour photos | Thin sections | SEM images | TEM images | vibrational spectra description | IR spectra | Raman spectra | N-IR spectra | F-IR spectra | IES spectra |