Danburite
Species
Rare · CaB₂Si₂O₈
Calcium borosilicate named after Danbury, Connecticut, forming colourless to wine-yellow prisms in granites, metamorphosed carbonate rocks and evaporites. Hard and clear, it is faceted as a collector's stone.
Identity
- Formula
- CaB₂Si₂O₈
- Chemical class
- Silicate
Crystallography
- Crystal system
- Orthorhombic
- Habits
- Prismatic, Wedge-shaped
- Fracture
- Subconchoidal
Physical properties
- Mohs hardness
- 7
- Density
- 3 g/cm³
- Luster
- Vitreous
- Colors
- colorless, white, wine yellow, yellowish brown
- Streak
- white
- Transparency
- Transparent
Geology
- Origins
- Metamorphic, Hydrothermal
- Host rocks
- Marble, Salt beds
- Associated minerals
- Quartz, Albite, Calcite, Fluorite
- Found in
- Evaporite deposit, Skarn
- Geography
- Mexico, Japan, Myanmar, Russia, USA (Connecticut)
Classification
- Rarity
- Rare
- Gem quality
- Yes
Arcane properties
- Affinity
- Light, Arcane
- Effects
- Warding, Scrying
- 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.
- J. W. Anthony, R. A. Bideaux, K. W. Bladh, M. C. Nichols, Danburite. Mineral Data Publishing, Handbook of Mineralogy, 2001.
- Danburite: Mineral information, data and localities. mindat.org.
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