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Papagoite

Cyclosilicate mineral

Field	Value
name	Papagoite
category	Cyclosilicate
image	Papagoite-k-152b.jpg
imagesize	260px
caption	Crystalline papagoite from Namibia (size: 5.9 x 3.3 x 2.1 cm)
formula	CaCuAlSi2O6(OH)3
IMAsymbol	Pap
strunz	9.CE.05
system	Monoclinic
class	Prismatic (2/m)
(same H-M symbol)
symmetry	C2/m
unit cell	a = 12.92 Å, b = 11.49 Å,
c = 4.69 Å; β = 100.81°; Z = 4
color	Dark blue crystals, light blue when massive
habit	Massive; cryptocrystalline, forming flat elongated crystals
cleavage	Imperfect in one direction
fracture	Brittle
mohs	5–5.5
luster	Vitreous to dull
refractive	nα = 1.607 nβ = 1.641 nγ = 1.672
opticalprop	Biaxial (-)
birefringence	δ = 0.065
2V	Measured: 78°
pleochroism	Trichroic
streak	Light blue
gravity	3.25
references

(same H-M symbol) c = 4.69 Å; β = 100.81°; Z = 4 Papagoite is a rare cyclosilicate mineral. Chemically, it is a calcium copper aluminium silicate hydroxide, found as a secondary mineral on slip surfaces and in altered granodiorite veins, either in massive form or as microscopic crystals that may form spherical aggregates. Its chemical formula is Ca Cu Al Si2O6(O H)3.

It was discovered in 1960 in Ajo, Arizona, United States, and was named after the Hia C-eḍ Oʼodham people (also known as the Sand Papago) who inhabit the area. This location is the only papagoite source within the United States, while worldwide it is also found in South Africa and Namibia. It is associated with aurichalcite, shattuckite, ajoite and baryte in Arizona, and with quartz, native copper and ajoite in South Africa. Its bright blue color is the mineral's most notable characteristic.

It is used as a gemstone.

References

File:Papagoite.jpg|Papagoite with conichalcite, from Ajo, Arizona. File:Copper-Papagoite-Quartz-tmu46b.jpg|Papagoite and native copper inclusions on a quartz crystal from Limpopo Province, South Africa (size 7.0 x 3.7 x 2.6 cm)

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Papagoite Mineralienatlas]
[http://www.mindat.org/min-3077.html MinDat]
[http://webmineral.com/data/Papagoite.shtml Webmineral]
[http://rruff.geo.arizona.edu/doclib/hom/papagoite.pdf Handbook of Mineralogy]
''Dictionary of Gems and Gemology'' By Mohsen Manutchehr-Danai p. 352

Info: Wikipedia Source

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calcium-minerals copper(ii)-minerals aluminium-minerals cyclosilicates monoclinic-minerals minerals-in-space-group-12 gemstones

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