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Hardystonite

Sorosilicate mineral

Field	Value
name	Hardystonite
category	Sorosilicates
image	Hardystonite-Clinohedrite-Calcite-170573.jpg
imagesize	260px
caption	Hardystonite is fluorescing blue in this Franklin Furnace specimen. Red is calcite, and green is willemite (size: 7.0 × 6.0 × 3.2 cm)
formula	Ca2ZnSi2O7
IMAsymbol	Hdy
strunz	9.BB.10
dana	55.4.2.2
system	Tetragonal
class	Scalenohedral (2m)
H-M symbol: ( 2m)
symmetry	P21m
unit cell	a = 7.8287(16) Å
c = 5.0140(2) Å; Z = 2
color	Light brownish white, pale greyish-white, very pale pink
habit	Massive granular
cleavage	[001] good, [100] and [110] fair
tenacity	Brittle
mohs	3–4
luster	Vitreous, resinous, greasy, dull
diaphaneity	Transparent to translucent
gravity	3.396–3.443
opticalprop	Uniaxial (−)
refractive	nω = 1.672 nε = 1.661
fluorescence	Purple to violet blue in short wave ultraviolet light
alteration	Hydrothermal alteration to clinohedrite
references

H-M symbol: ( 2m) c = 5.0140(2) Å; Z = 2 | length fast/slow = Hardystonite is a rare calcium zinc silicate mineral first described from the Franklin, New Jersey, U.S. zinc deposits. Like many of the famous Franklin minerals, hardystonite responds to short wave ultraviolet (254 nm wavelength) light, emitting a fluorescence from dark purple to bright violet blue. In daylight, it is white to gray to light pink in color, sometimes with a vitreous or greasy luster. It is very rarely found as well formed crystals, and these are usually rectangular in appearance and rock-locked.

Hardystonite in plain light, same sample as in fluorescent light image above right

Hardystonite has a chemical composition of Ca2ZnSi2O7. It is frequently found with willemite (fluoresces green), calcite (fluoresces red), and clinohedrite (fluoresces orange). Hardystonite can be found altered to clinohedrite CaZn(SiO4)·H2O through direct hydrothermal alteration. Other minerals often associated with hardystonite are franklinite, diopside, andradite garnet, and esperite (fluoresces yellow).

It was first described in 1899 by J.E. Wolff, when the New Jersey Zinc Company mines were located in what was called Franklin Furnace, in Hardyston Township, New Jersey.

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
http://www.mindat.org/min-1818.html Mindat
http://www.webmineral.com/data/Hardystonite.shtml Webmineral data
[http://rruff.geo.arizona.edu/doclib/hom/hardystonite.pdf Handbook of Mineralogy]
Q58144929. Palache, Charles
Dunn, Pete J. Franklin and Sterling Hill, New Jersey: the world's most magnificent mineral deposits. Dr. Pete J. Dunn, 2004.

Info: Wikipedia Source

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calcium-minerals sorosilicates zinc-minerals tetragonal-minerals minerals-in-space-group-113 minerals-described-in-1899

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