Chondrodite
Mineral (Mg,Fe)5(SiO4)2(F,OH)2
About it
Yellow to red-brown grains and crystals in marble and skarn; New York's Tilly Foster mine gave the finest dark red crystals.
- Type
- Mineral
- Group
- Silicate (nesosilicate), humite group
- Formula
- (Mg,Fe)5(SiO4)2(F,OH)2
- Hardness (Mohs)
- 6–6.5
- Specific gravity
- 3.16–3.26
- Streak
- white
- Lustre
- vitreous (glassy), resinous
- Crystal system
- Monoclinic
- Colours
- yellow, orange, brown, red
- Transparency
- transparent, translucent
- Cleavage and fracture
- poor; uneven fracture
Typical values: real specimens vary. For more, see mindat.org.