Turquoise and Pyrite

ID	107
Mineral	Turquoise Pyrite
Location	Sonora - Mexico
Fluorescence	LW-UV: close SW-UV: close
Mindat.org	View Turquoise information at mindat.org View Pyrite information at mindat.org

ID	4060
Long ID	1:1:4060:6
Formula	`CuAl₆(PO₄)₄(OH)₈ · 4H₂O`
IMA Status	0 1
Other Occurrences	Secondary mineral in potassic alteration zone of porphyry copper deposits. Vein fillings in volcanic rocks and phosphate-rich sediments.
Industrial	Jewelry stone.
Discovery Year	1678
Diapheny	Transparent,Translucent,Opaque
Cleavage	on {001}, good on {010}
Tenacity	brittle
Colour	bright blue, sky-blue, pale green, blue-green, turquoise-blue, apple-green, green-gray
Hardness (min)	5.0
Hardness (max)	6.0
About the name	Named from French "turques" or "turquois" meaning "Turkish" the original material found on the south slopes of the Al-Mirsah-Kuh Mountains (Iran), but which found its way to Europe via Turkey. The name was known at least as early as the 17th century C.E. Turquoise and members of its group were redefined by Foord and Taggert in 1998, with turquoise reserved for an end-member composition. Foord and Taggert (1998) also noted that most of the gem material labeled "turquoise" is inhomogeneous and that planerite is the most common constituent in commercial "turquoise".
Streak	Pale greenish blue to white
Crystal System	Triclinic
Cleavage Type	Perfect
Fracture type	Irregular/Uneven,Sub-Conchoidal
Morphology	Crystals rare. Steep pinacoidal crystals exhibiting {010}, {1_10} and {001}. Fine granular, globular crusts, veinlets, massive.
UV	Not fluorescent in UV
Comment Luster	Dull to waxy in massive varieties, subvitreous in crystals.
key_elements	0
shortcode_ima	Tqu
Group	Turquoise Group

ID	3314
Long ID	1:1:3314:1
Formula	`FeS₂`
IMA Status	0 1
Other Occurrences	Common in many rock types, igneous, metamorphic and sedimentary.
Diapheny	Opaque
Cleavage	Indistinct on {001}.
Tenacity	brittle
Colour	Pale brass-yellow
Hardness (min)	6.0
Hardness (max)	6.5
About the name	Named in antiquity from the Greek "pyr" for "fire", because sparks flew from it when struck with another mineral or metal. Known to Dioscorides (~50 CE) under the name "περι υληζ ιατρικηζ" which included both pyrite and chalcopyrite.
Streak	Greenish-black
Crystal System	Isometric
Cleavage Type	Poor/Indistinct
Fracture type	Irregular/Uneven,Conchoidal
Morphology	Typically cubic or pyritohedral (pentagonal dodecahedral), sometimes octahedral and combinations are common, resulting in striated faces. Less frequently octahedral, most commonly massive, granular, and sometimes radiating, reniform, discoidal or globular.
Twinning	On [110], interpenetrating ('Iron Cross Law'). Twin axis [001] and twin plane {011}, penetration and contact twins. Twinning on (111) was described by Nicol (1904), Goldschmidt and Nicol (1904) and Gaubert (1928), all of whom considered it rare.
UV	Not fluorescent in UV
Thermal Behaviour	Heated in a closed tube gives a sublimate of sulfur and a magnetic residue.
shortcode_ima	Py
Group	Pyrite Group

Price: € 5

Dimensions: Not registered

Weight: Not registered

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