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Goslarite

Field	Value
name	Goslarite
image	File:Goslarita. Gostar.Hartz,Sajonia.JPG
imagesize	260px
caption	Goslarite on display at the Museo Nacional de Ciencias Naturales
category	Sulfate mineral
formula
IMAsymbol	Gos
molweight	287.56 g/mol
strunz	7.CB.40
system	Orthorhombic
class	Disphenoidal (222)
(same H-M symbol)
symmetry	P212121
unit cell	a = 11.8176 Å, b = 12.0755 Å
c = 6.827 Å, Z = 4
color	Colorless, pinkish, white, greenish, green, blue, green blue, bluish and brownish
habit	Acicular, massive, stalactitic
cleavage	{010} perfect
fracture	Conchoidal
tenacity	Brittle
mohs	2.0–2.5
luster	Vitreous (glassy)
opticalprop	Biaxial (-)
refractive	nα = 1.447 - 1.463 nβ = 1.475 - 1.480 nγ = 1.470 - 1.485
birefringence	δ = 0.0220–0.0230
pleochroism	none
2V	46°
streak	White
gravity	1.96
references

(same H-M symbol) c = 6.827 Å, Z = 4

Goslarite is a hydrated zinc sulfate mineral () which was first found in the Rammelsberg mine, Goslar, Harz, Germany. It was described in 1847. Goslarite belongs to the epsomite group which also includes epsomite () and morenosite (). Goslarite is an unstable mineral at the surface and will dehydrate to other minerals like bianchite (), boyleite () and gunningite ().

Physical properties

The composition of goslarite was determined by the US National Bureau of Standards (now the National Institute of Standards and Technology) in 1959 as follows: SO3 27.84 wt%, ZnO 28.30 wt% and 43.86 wt%.

Goslarite's cleavage is perfect in {010}, as for epsomite and morenosite. The color of goslarite ranges from brownish to pinkish, blue, brown, colorless, green and green blue. The luster ranges from vitreous to nacreous and silky (if fibrous). Goslarite is soluble in water, has an astringent taste, and is strongly diamagnetic.

Geologic occurrence

Goslarite is formed from the oxidation of sphalerite ((Zn, Fe)S). It was first found in Rammelsberg mine, Goslar, Harz, Germany. It often occurs as an efflorescence on timbers and walls of mine passages. Goslarite is widespread as a post mining efflorescence in mines that contain sphalerite or any zinc minerals.

Economical uses

In the pharmaceutical industry it is used as a direct emetic, antiseptic and disinfectant.

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
"Handbook of Mineralogy". Mineralogical Society of America.
[http://www.mindat.org/min-1731.html Goslarite on Mindat]
[http://www.webmineral.com/data/Goslarite.shtml Goslarite data on Webmineral]
Hurlbut, Cornelius S.; Klein, Cornelis, 1985, ''Manual of Mineralogy,'' 20th ed., {{ISBN. 0-471-80580-7
Dana, J.D.. (1854). "A System of Mineralogy Comprising The Most Recent Discoveries". Putnam.
Egleston, T. (1871). "Catalogue of Minerals, with Their Formulae and Crystalline Systems: Prepared for the Use of the Students of the School of Mines, of Columbia College". Angell.
Palache. (1944). "The System of Mineralogy". John Wiley & Sons.
Gaines, RV. (1997). "Dana's New Mineralogy". John Wiley & Sons.
(2009). "Clay and non-clay minerals in the pharmaceutical and cosmetic industries Part II. Active ingredients". Applied Clay Science.

Info: Wikipedia Source

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zinc-minerals sulfate-minerals heptahydrate-minerals orthorhombic-minerals minerals-in-space-group-19 minerals-described-in-1847

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