simpsonite
Sign in to saveSimpsonite has a general formula of . It occurs as euhedral to subhedral tabular to short and prismatic crystals, commonly in subparallel groups. Under the petrographic microscope it has a very high relief.
Key facts
- Mineral.mohs
- 7–7.5
- Mineral.name
- Simpsonite
- Mineral.category
- Oxide minerals
- Mineral.image
- Simpsonite-154999.jpg
- Mineral.imagesize
- 300px
- Mineral.caption
- Locality: Alto do Giz pegmatite, Rio Grande do Norte, Brazil. Size: 1.6 × 1.5 × 1.8 cm.
- Mineral.IMAsymbol
- Spn
- Mineral.molweight
- 813.65 g/mol
- Mineral.strunz
- 4.DC.10
- Mineral.system
- Trigonal
- Mineral.class
- Pyramidal (3) H-M symbol: (3)
- Mineral.symmetry
- P3
- Mineral.unit cell
- a = 7.37, c = 4.51 [Å]; Z = 1
- Mineral.color
- White to cream, yellow to yellow-brown when altered
- Mineral.habit
- Euhedral, prismatic, striated
- Mineral.cleavage
- None
- Mineral.fracture
- Conchoidal
- Mineral.tenacity
- Brittle
via Wikipedia infobox
Wikidata facts
- Subclass of
- oxide class of minerals
- Image
- Simpsonite-154999.jpg
Show 8 more facts
- Commons category
- Simpsonite
- Nickel-Strunz 9th edition (updated 2009)
- 4.DC.10
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 4.DC.10
- crystal system
- trigonal crystal system
- streak color
- white
- IMA Mineral Symbol
- Spn
- chemical formula
- Al₄Ta₃O₁₃(OH)
- Strunz 8th edition (series ID, updated)
- IV/D.15
Sources (1)
via Wikidata · CC0
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Encyclopedic overview
1 sectionsContents
- References
Simpsonite has a general formula of . It occurs as euhedral to subhedral tabular to short and prismatic crystals, commonly in subparallel groups. Under the petrographic microscope it has a very high relief.
Discovered in 1938, it was named after Edward Sydney Simpson (1875–1939), government mineralogist and analyst of Western Australia. It is an accessory mineral in some tantalum-rich granite pegmatites. It occurs in association with tantalite, manganotantalite, microlite, tapiolite, beryl, spodumene, montebrasite, pollucite, petalite, eucryptite, tourmaline, muscovite and quartz. It is found in a few locations around the world, notably in the Onca and Paraíba mines of Rio Grande do Norte, Brazil and at Tabba Tabba, Western Australia.
Excerpted from Wikipedia’s “simpsonite” article, available under the CC BY-SA 4.0 licence.