Arsenopyrite and Sphalerite

ID	312
Mineral	Arsenopyrite Sphalerite
Location	Minas Panasqueira - Portalegre - Portugal
Fluorescence	LW-UV: close SW-UV: close
Mindat.org	View Arsenopyrite information at mindat.org View Sphalerite information at mindat.org

ID	305
Long ID	1:1:305:8
Formula	`FeAsS`
IMA Status	0 1
Other Occurrences	High-temperature gold-quartz or tin hydrothermal veins, pegmatites, contact metamorphic rocks, gneisses, schists.
Discovery Year	1847
Diapheny	Opaque
Cleavage	Distinct on {001}; {010} in traces
Tenacity	brittle
Colour	Silver-white to steel-gray, may have a slight yellow appearance
Hardness (min)	5.5
Hardness (max)	6.0
Luminescence	None
Lustre	Metallic.
About the name	Named in 1847 by Ernst Friedrich Glocker for its composition, a contraction of the antiquated term "arsenical pyrite." Arsenopyrite was known much before 1847 and arsenopyrite, as a name, may be taken as a simple translation of "arsenkies".
Streak	Gray-black
Crystal System	Monoclinic
Cleavage Type	Distinct/Good
Fracture type	Irregular/Uneven
Morphology	Flat tabular to blocky (sometimes pseudo-octahedral) to prismatic.
Twinning	Common on {100} and {001}. Contact or penetration on {101}, on {012} trillings or cruciform.
UV	Not fluorescent
key_elements	0
shortcode_ima	Apy
Group	Arsenopyrite Group

ID	3727
Long ID	1:1:3727:9
Formula	`ZnS`
IMA Status	0 1
Discovery Year	1847
Diapheny	Transparent,Translucent
Cleavage	Perfect {011}
Tenacity	brittle
Colour	Yellow, light to dark brown, black, red-brown, colourless, light blue. green
Hardness (min)	3.5
Hardness (max)	4.0
Luminescence	Fluorescent and triboluminescent
Lustre	Resinous
About the name	Originally called blende in 1546 by Georgius Agricola (Georg Bauer). Known by a variety of chemical-based names subsequent to Agricola and before Glocker, including "zincum". Named Sphalerite in 1847 by Ernst Friedrich Glocker from the Greek σφαλεροζ "sphaleros" = treacherous, in allusion to the ease with which dark varieties were mistaken for galena, but yielded no lead.
Streak	Pale yellow to brown.
Crystal System	Isometric
Cleavage Type	Perfect
Fracture type	Conchoidal
Twinning	{111}
UV	Light colored sphalerite may fluoresce in blue or orange in LW. Fluoresces less strongly, sometimes not at all, in SW or MW.
key_elements	0
shortcode_ima	Sp
Group	Sphalerite Group

Price: € 20

Dimensions: Not registered

Weight: 316 g

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