Bismuthinite
Mineral Bi2S3
Also called Bismuth glance
About it
Looks like stibnite but is noticeably heavier and often tarnishes yellowish or iridescent. Found in tin and tungsten veins, as at Tazna and Llallagua in Bolivia, and in Cornwall.
- Type
- Mineral
- Group
- Sulfide, stibnite group
- Formula
- Bi2S3
- Hardness (Mohs)
- 2
- Specific gravity
- 6.8–7.2
- Streak
- lead grey
- Lustre
- metallic
- Crystal system
- Orthorhombic
- Colours
- lead grey to tin white, yellowish to iridescent tarnish
- Transparency
- opaque
- Cleavage and fracture
- perfect lengthwise in one direction
Typical values: real specimens vary. For more, see mindat.org.