From Surf Wiki (app.surf) — the open knowledge base

Simpsonite

Field	Value
name	Simpsonite
category	Oxide minerals
image	Simpsonite-154999.jpg
imagesize	300px
caption	Locality: Alto do Giz pegmatite, Rio Grande do Norte, Brazil. Size: 1.6 × 1.5 × 1.8 cm.
formula
IMAsymbol	Spn
molweight	813.65 g/mol
strunz	4.DC.10
system	Trigonal
class	Pyramidal (3)
H-M symbol: (3)
symmetry	P3
unit cell	a = 7.37, c = 4.51 [Å]; Z = 1
color	White to cream, yellow to yellow-brown when altered
habit	Euhedral, prismatic, striated
cleavage	None
fracture	Conchoidal
tenacity	Brittle
mohs	7–7.5
luster	Vitreous to adamantine
refractive	nω = 2.045 nε = 2.025
opticalprop	Uniaxial negative
birefringence	δ = 0.020
streak	White
gravity	6.7
diaphaneity	Semitransparent
other	Blue-white cathodoluminescence and yellow fluorescence in SW UV
references

H-M symbol: (3)

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.

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
[http://rruff.geo.arizona.edu/doclib/hom/simpsonite.pdf Handbook of Mineralogy]
[http://www.webmineral.com/data/Simpsonite.shtml Webmineral data]
[http://www.mindat.org/min-3670.html Simpsonite: Mindat.org]
Philonen, P.C., Grew, E.S., Ercit, T.S., Roberts, A.C., Jambor, J.L. (2005) New mineral names. American Mineralogist, 90, 1227–1233

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

aluminium-minerals oxide-minerals tantalum-minerals niobium-minerals trigonal-minerals minerals-in-space-group-143 minerals-described-in-1938

Want to explore this topic further?

Ask Mako anything about Simpsonite — get instant answers, deeper analysis, and related topics.

Research with Mako

Free with your Surf account

Content sourced from Wikipedia, available under CC BY-SA 4.0.

This content may have been generated or modified by AI. CloudSurf Software LLC is not responsible for the accuracy, completeness, or reliability of AI-generated content. Always verify important information from primary sources.

Report