Humite
Mineral (Mg,Fe)7(SiO4)3(F,OH)2
About it
Yellow to brown grains in marble, told from chondrodite only by optics or X-rays; named for Sir Abraham Hume and first found at Monte Somma, Italy.
- Type
- Mineral
- Group
- Silicate (nesosilicate), humite group
- Formula
- (Mg,Fe)7(SiO4)3(F,OH)2
- Hardness (Mohs)
- 6
- Specific gravity
- 3.2–3.32
- Streak
- white
- Lustre
- vitreous (glassy)
- Crystal system
- Orthorhombic
- Colours
- white, yellow, dark orange, brown
- Transparency
- transparent, translucent
- Cleavage and fracture
- poor; uneven fracture
Typical values: real specimens vary. For more, see mindat.org.