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Kampfite

Phyllosilicate mineral

Field	Value
name	Kampfite
image	Traskite (brown)-Kampfite (bluish).jpg
imagesize	260px
caption	Traskite (brown) and Kampfite (bluish), from Big Creek, Fresno County, California, United States of America
category	Phyllosilicate minerals
formula
IMAsymbol	Kpfb
strunz	9.EG.20
system	Monoclinic
class	Domatic (m)
(same H-M symbol)
symmetry	Cc
unit cell	a = 31.2329, b = 5.2398
c = 9.0966 [Å]; β = 106.933°; Z = 1
color	Light blue gray
habit	Irregular grains or anhedral crystal inclusions
cleavage	Good on {001}
fracture	Uneven
tenacity	Brittle
mohs	3
luster	Vitreous
streak	White
diaphaneity	Translucent
gravity	3.45
opticalprop	Uniaxial – (strongly pseudohexagonal)
refractive	nω = 1.642 nε = 1.594
birefringence	δ = 0.048
references

(same H-M symbol) c = 9.0966 [Å]; β = 106.933°; Z = 1 | length fast/slow = Kampfite is a rare barium silicate–carbonate–halide mineral with the chemical formula . Discovered in 1964 and described in 2001, it is named after Anthony R. Kampf. The mineral is known only from Fresno County, California.

Description

Kampfite is translucent and light blue-gray in color. Specimens occur as irregular masses up to 1 cm in size.

Composition and structure

When first described, the formula was identified as . Subsequent work on analyzing the crystal structure led to a revised formula of . The structural noted in the original description was not found in the later work.

The structure consists of double layers of tetrahedra connected by barium-containing polyhedra. It is this layering which causes kampfite's one perfect cleavage. Kampfite shares chemical and structural similarities with cymrite. , it is the only known barium silicate carbonate aside from fencooperite.

Occurrence

Kampfite has been found in association with celsian, fresnoite, macdonaldite, pyrrhotite, titantaramellite, traskite, and witherite. The mineral is known only from locations in Fresno County, California. Kampfite is found in quartz-rich regions of sanbornite rocks within gneiss which has undergone contact metamorphism associated with an adjacent granodiorite intrusive.

History

The mineral discovered in 1964 by Robert Walstrom from the Esquire #1 claim of the Rush Creek deposit in eastern Fresno County. It was described in 2001 in The Canadian Mineralogist. The mineral was named kampfite in honor of Anthony Robert Kampf (1948–), curator of the Los Angeles County Museum of Natural History, for his crystallography work on new and rare minerals.

Co-type specimens are held by the University of British Columbia and the Geological Survey of Canada.

References

Bibliography

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
[http://www.mindat.org/min-10386.html Kampfite on Mindat.org]
[https://www.webmineral.com/data/Kampfite.shtml#.UpvfktLjW1U Kampfite data on Webmin]
"Kampfite". Mineralogical Society of America.

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.

barium-minerals carbonate-minerals phyllosilicates monoclinic-minerals minerals-in-space-group-9

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