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Marialite

Sodium endmember in the scapolite group of tectosilicate minerals

Field	Value
boxbgcolor	#d1b05c	name = Marialite
image	Marialite-169082.jpg
imagesize	260px
category	Tectosilicate minerals
group	Scapolite group
formula
IMAsymbol	Mar
strunz	9.FB.15
system	Tetragonal
class	Dipyramidal (4/m)
(same H-M symbol)
symmetry	I4/m
unit cell	a = 12.06 Å, c = 7.572(3) Å; Z = 2
color	Colorless, white, grey; pink, violet, blue, yellow, brown, orange-brown, pale green or reddish
habit	Typically flat, pyramidal striated crystals; massive, granular
cleavage	Distinct on {100} and {110}
fracture	Uneven to conchoidal
tenacity	Brittle
mohs	–6
luster	Vitreous, pearly, resinous
streak	White
diaphaneity	Transparent to opaque
gravity	2.55–2.74
density	2.5–2.62 g/cm3
opticalprop	Uniaxial (−)
refractive	nω = 1.539–1.550 nε = 1.532–1.541
birefringence	δ = 0.007 – 0.009
references	Klein, C., and Dutrow, B. (2007) The 23rd Edition of the Manual of Mineral Science, 675 p. John Wiley and Sons, Inc. Hoboken, New
Jersey, U.S.A.</ref><ref name	HBM[Handbook of Mineralogy](http://rruff.geo.arizona.edu/doclib/hom/marialite.pdf)

(same H-M symbol) | length fast/slow = Jersey, U.S.A.

Marialite is a silicate mineral with a chemical formula of if a pure endmember or with increasing meionite content. Marialite is the sodium endmember of the scapolite group and a solid solution exists between marialite and meionite, the calcium endmember. It is a rare mineral usually used as a collector's stone.

Crystallography

Marialite has tetragonal crystallography and a 4/m crystal class. It has a 4 fold rotation with 90° mirror planes. Crystals are usually prismatic with prominent forms of prisms and dipyramids.

Marialite belongs to a uniaxial negative optical class which means it has one circular section and a principal section shaped like an oblate sphenoid.

Discovery and occurrence

Marialite was first described in 1866 for an occurrence in the Phlegrean Volcanic complex, Campania, Italy. It was named by German mineralogist Gerhard vom Rath for his wife, Maria Rosa vom Rath.

Marialite occurs in regional and contact metamorphism: marble, calcareous gneiss, granulite and greenschist. It also occurs in skarn, pegmatite and hydrothermally altered volcanic rocks. This means that Marialite is formed in high pressure and/or high temperature environments.

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Marialith Mineralienatlas]
[http://rruff.geo.arizona.edu/doclib/hom/marialite.pdf Handbook of Mineralogy]
[http://www.mindat.org/min-2575.html Mindat.org]
[http://www.webmineral.com/data/Marialite.shtml Webmineral data]
Johnsen, O. (2000) Photographic Guide to Minerals of the World. 439 p. Oxford University Press, Great Clarendon Street, Oxford

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.

sodium-minerals aluminium-minerals chloride-minerals tetragonal-minerals minerals-in-space-group-87 scapolite-group

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