gehlenite
Sign in to saveGehlenite, (Ca2Al[AlSiO7]), is a sorosilicate, Al-rich endmember of the melilite complete solid solution series with akermanite. The type locality is in the Monzoni Mountains, Fassa Valley in Trentino in Italy, and is named after the Adolf Ferdinand Gehlen (1775–1815) by A.J. Fuchs in 1815.
Key facts
- Mineral.name
- Gehlenite
- Mineral.category
- Sorosilicates
- Mineral.image
- Gehlenite-sea65a.jpg
- Mineral.formula
- Ca2Al[AlSiO7]
- Mineral.IMAsymbol
- Gh
- Mineral.strunz
- 9.BB.10
- Mineral.system
- Tetragonal
- Mineral.class
- Scalenohedral (2m) H-M symbol: ( 2m)
- Mineral.symmetry
- P21m
- Mineral.colour
- yellow-brown, green-grey, colourless
- Mineral.cleavage
- Distinct/good
- Mineral.mohs
- 5–6
- Mineral.lustre
- vitreous, greasy
- Mineral.birefringence
- δ = 0.010
- Mineral.streak
- white, grey-white
via Wikipedia infobox
Wikidata facts
- Image
- Gehlenite-sea65c.jpg
Show 6 more facts
- Nickel-Strunz 9th edition (updated 2009)
- 9.BB.10
- Commons category
- Gehlenite
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 9.BB.10
- IMA Mineral Symbol
- Gh
- chemical formula
- Ca₂Al(SiAl)O₇
- Strunz 8th edition (series ID, updated)
- VIII/B.02
Sources (2)
via Wikidata · CC0
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Article
3 sectionsContents
- Geological occurrence
- Crystallography, composition and physical properties
- References
Gehlenite, (Ca2Al[AlSiO7]), is a sorosilicate, Al-rich endmember of the melilite complete solid solution series with akermanite. The type locality is in the Monzoni Mountains, Fassa Valley in Trentino in Italy, and is named after the Adolf Ferdinand Gehlen (1775–1815) by A.J. Fuchs in 1815.
==Geological occurrence== Gehlenite is found in carbonaceous chondrites from which it condensed as a refractory mineral in the hotter stages (FU Ori) of the presolar nebula, and was subsequently consumed in processes which created enstatite and other more abundant minerals making it a remnant mineral from the early solar nebula (along with corundum and spinel). Its occurrence in the early condensation phase of the solar nebula was predicted by Harry Lord in the 1950s, but studies of carbonaceous chondrites did not support this claim until the Allende meteorite was discovered in 1969. It is also found in diorite intruded carbonate rocks, and to a far lesser extent in uncompahgrites, melilitites, alnoites, lamprophyres and possibly kimberlite pipes.