danburite
Sign in to saveDanburite is a calcium boron silicate mineral with a chemical formula of CaB2(SiO4)2.
Key facts
- Mineral.name
- Danburite
- Mineral.image
- Danburite-162634.jpg
- Mineral.imagesize
- 260px
- Mineral.caption
- Cluster of creamy crystals of danburite
- Mineral.category
- Tectosilicate minerals
- Mineral.formula
- CaB2(SiO4)2
- Mineral.IMAsymbol
- Dbu
- Mineral.IMAstatus
- Grandfathered (1839)
- Mineral.strunz
- 9.FA.65
- Mineral.dana
- 56.3.1.1
- Mineral.system
- Orthorhombic
- Mineral.class
- Rhombic dipyramidal (mmm)
- Mineral.symmetry
- Pnam (no. 62)
- Mineral.unit cell
- a = 8.038(3), b = 8.752(5) c = 7.73 [Å]; Z = 4
- Mineral.colour
- Colourless, white, gray, brownish white, straw yellow
- Mineral.habit
- Euhedral prismatic crystals; disseminated masses
- Mineral.cleavage
- {001} Poor
- Mineral.fracture
- Subconchoidal to uneven
via Wikipedia infobox
Wikidata facts
- Image
- DanburiteMexique.jpg
Show 6 more facts
- IMA Mineral Symbol
- Dbu
- Commons category
- Danburite
- chemical formula
- CaB₂Si₂O₈
- Nickel-Strunz 9th edition (updated 2009)
- 9.FA.65
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 9.FA.65
- Strunz 8th edition (series ID, updated)
- VIII/F.04
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{{Infobox mineral | name = Danburite | boxwidth = | boxbgcolor = | image = Danburite-162634.jpg | imagesize = 260px | alt = | caption = Cluster of creamy crystals of danburite | category = Tectosilicate minerals | formula = CaB2(SiO4)2 | IMAsymbol = Dbu | IMAstatus = Grandfathered (1839) | strunz = 9.FA.65 | dana = 56.3.1.1 | system = Orthorhombic | class = Rhombic dipyramidal (mmm) | symmetry = Pnam (no. 62) | unit cell = a = 8.038(3), b = 8.752(5) c = 7.73 [Å]; Z = 4 | colour = Colourless, white, gray, brownish white, straw yellow | habit = Euhedral prismatic crystals; disseminated masses | twinning = | cleavage = {001} Poor | fracture = Subconchoidal to uneven | tenacity = Brittle | mohs = 7 – 7.5 | lustre = Vitreous to greasy | streak = White | diaphaneity = Transparent to translucent | gravity = 2.93 – 3.02 | density = | polish = | opticalprop = Biaxial (+/-) | refractive = nα = 1.627 – 1.633 nβ = 1.630 – 1.636 nγ = 1.633 – 1.639 | birefringence = δ = 0.006 | pleochroism = | 2V = 88 to 90° measured | dispersion = r 2(SiO4)2.
It has a Mohs hardness of 7 to 7.5 and a specific gravity of 3.0. The mineral has an orthorhombic crystal form. It is usually colourless, like quartz, but can also be either pale yellow or yellowish-brown. It typically occurs in contact metamorphic rocks.