Kyawthuite
Species
Legendary · BiSbO₄
Known from a single crystal, a waterworn orange prism found in the gem gravels near Mogok in Myanmar and approved as a new species in 2015. A bismuth antimonate of great density, it was cut into a 1.61-carat gem now in the Natural History Museum of Los Angeles County.
Identity
- Formula
- BiSbO₄
- Chemical class
- Oxide
Crystallography
- Crystal system
- Monoclinic
- Habits
- Prismatic
- Fracture
- Conchoidal
Physical properties
- Mohs hardness
- 5
- Density
- 8.26 g/cm³
- Luster
- Adamantine
- Colors
- orange, reddish orange
- Streak
- white
- Transparency
- Transparent
Geology
- Origins
- Igneous
- Host rocks
- River gravels and sands
- Found in
- Placer deposit
- Geography
- Myanmar (Mogok only)
Classification
- Rarity
- Legendary
- Gem quality
- Yes
Arcane properties
- Affinity
- Arcane, Void
- Effects
- Planar travel, Time
- Planar origin
- Material Plane
Sources
- M. Pasero and others, IMA Commission on New Minerals, Nomenclature and Classification, The New IMA List of Minerals, updated September 2026. International Mineralogical Association (CNMNC), 2026.
- Kyawthuite. Mineralogical Society of America, Handbook of Mineralogy, 2017.
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