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Clintonite

Phyllosilicate mineral in the brittle mica group

Field	Value
name	Clintonite
category	Phyllosilicate minerals
group	Mica group, brittle mica group
image	Clintonite-Spinel-235093.jpg
caption	Clintonite with spinel on orthoclase matrix from Amity, New York (size: 9.3 × 5.7 × 3.8 cm)
formula
IMAsymbol	Cln
system	Monoclinic
class	Prismatic (2/m)
or domatic (m)
symmetry	C2/m or (?)
unit cell	a = 5.204 Å,
b = 9.026 Å,
c = 9.812 Å;
β = 100.35°; Z = 2
color	Colorless, yellow, orange, red-brown, brown, green
habit	Tabular pseudohexagonal crystals; foliated or lamellar radiated; massive
twinning	Spiral polysynthetic twinning
cleavage	Perfect on {001}
tenacity	Brittle
mohs	3.5 on {001}, 6 at angle to {001}
luster	Vitreous, pearly, submetallic
streak	White, slightly yellow-gray
diaphaneity	Transparent to translucent
gravity	3.0–3.1
opticalprop	Biaxial (−)
refractive	nα = 1.643 – 1.648 nβ = 1.655 – 1.662 nγ = 1.655 – 1.663
birefringence	δ = 0.012 – 0.015
pleochroism	X = colorless, pale orange, red-brown; Y = Z = pale brownish yellow, pale green
2V	Measured: 2° to 40°
references

or domatic (m) b = 9.026 Å, c = 9.812 Å; β = 100.35°; Z = 2 | length fast/slow = Clintonite is a calcium magnesium aluminium phyllosilicate mineral. It is a member of the margarite group of micas and the subgroup often referred to as the "brittle" micas. Clintonite has the chemical formula . Like other micas and chlorites, clintonite is monoclinic in crystal form and has a perfect basal cleavage parallel to the flat surface of the plates or scales. The Mohs hardness of clintonite is 6.5, and the specific gravity is 3.0 to 3.1. It occurs as variably colored, colorless, green, yellow, red, to reddish-brown masses and radial clusters.

The brittle micas differ chemically from the micas in containing less silica and no alkalis, and from the chlorites in containing much less water; in many respects, they are intermediate between the micas and chlorites. Clintonite and its iron-rich variety xanthophyllite are sometimes considered the calcium analogues of the phlogopites.

Typical formation environment is in serpentinized dolomitic limestone and contact metamorphosed skarns. It occurs with talc, spinel, grossular, vesuvianite, clinopyroxene, monticellite, chondrodite, phlogopite, chlorite, quartz, calcite and dolomite.

Clintonite was first described in 1843 for an occurrence in Orange County, New York. It was named for De Witt Clinton (1769–1828).

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Clintonite Mineralienatlas]
[http://webmineral.com/data/Clintonite.shtml Webmineral]
[http://www.mindat.org/min-1088.html Mindat with location data]
[http://rruff.geo.arizona.edu/doclib/hom/clintonite.pdf Handbook of Mineralogy]
{{EB1911. Leonard James. Spencer
Alietti, Elisa. (1997). "Clintonite-1M: Crystal chemistry and its relationships to closely associated Al-rich phlogopite". American Mineralogist.

Info: Wikipedia Source

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magnesium-minerals calcium-minerals aluminium-minerals monoclinic-minerals minerals-in-space-group-12 brittle-mica-group

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