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
- Image
- Simpsonite-154999.jpg
Show 6 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
- IMA Mineral Symbol
- Spn
- chemical formula
- Al₄Ta₃O₁₃(OH)
- Strunz 8th edition (series ID, updated)
- IV/D.15
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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.