Khinite
{{Short description|Rare orthotellurate mineral}}
{{Infobox mineral |name=Khinite|boxwidth=|boxbgcolor=|image= Khinite.jpg|imagesize=|alt=|caption=Dark green Khinite crystals from the type locality (Bird Nest Drift, San Bernardino County, California, United States of America).|category=Tellurate minerals|formula=PbCu3TeO6(OH)2| IMAsymbol = Khn{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|url=https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}|molweight= |strunz=4.FD.30|dana=33.1.3.1 |system=Orthorhombic|class=|symmetry= |unit cell=Khinite-4O:
a = 5.740 Å,
b = 9.983 Å,
c = 23.960 Å, Z = 8
Khinite-3T (parakhinite):
a = 5.753 Å,
c = 17.958 Å, Z = 3|color=Dark green – Bottle green|habit=Dipyramidal or curved crystals|twinning=|cleavage={001} fair|fracture= |tenacity=Brittle|mohs=3.5|luster=Vitreous|streak=Green|diaphaneity=Semitransparent|gravity = 6.5–7.0 (measured) 6.69 (calculated)|polish=|opticalprop=Biaxial (+) (khinite) Uniaxial (−) (parakhinite)|refractive=|birefringence=δ = 0.055|pleochroism=Yellow green – emerald green|2V=20o|dispersion=|extinction=|length fast/slow=|fluorescence=None|absorption=|melt=|fusibility=Fuses readily to a brown slag|diagnostic=|solubility=Soluble in cold acids|impurities=Ca|alteration=|other=|prop1=|prop1text=|references={{ref|1}}{{ref|2}}{{ref|3}}{{ref|4}}{{ref|5}}{{ref|6}}}}
Khinite is a rare orthotellurate mineral with the formula Pb2+Cu2+3TeO6(OH)2.{{Cite web|url=http://www.mindat.org/min-2199.html|title=Khinite: Khinite mineral information and data.|website=www.mindat.org|access-date=2016-10-28}}{{Cite web|url=http://www.webmineral.com/data/Khinite.shtml|title=Khinite Mineral Data|last=Barthelmy|first=Dave|website=www.webmineral.com|access-date=2016-10-28}}{{Cite journal|last=Williams|first=S.A.|date=1978|title=Khinite, parakhinite, and dugganite, three new tellurates from Tombstone. Arizona|url=http://www.minsocam.org/ammin/AM63/AM63_1016.pdf|journal=American Mineralogist|volume=63|pages=1016–1019}} It crystallizes in the orthorhombic system and has a bottle-green colour. It is often found as dipyramidal, curved or corroded crystals no more than 0.15 mm in size.{{Cite web|url=http://rruff.info/doclib/hom/khinite.pdf|title=Handbook of mineralogy, Khinite|last=|first=|date=|website=|publisher=|access-date=}} The tetragonal dimorph of khinite is called parakhinite.
Occurrence and name
Both khinite and parakhinite were first identified in 1978 in the Old Guard Mine (Royal Guard Mine), Tombstone District, Cochise County, Arizona, US They were named after Ba-Saw Khin, a Burmese-American mineralogist. They are often found together with tenorite, quetzalcoatlite, quartz, gold, dugganite, chrysocolla, chlorargyrite, bromargyrite, xocomecatlite, and tlapallite. Khinite and parakhinite are found in multiple mines across Mexico and the USA.
Parakhinite
Parakhinite crystallizes in the tetragonal system. Khinite and parakhinite are also called khinite-4O and khinite-3T, respectively. Khinite and parakhinite are identical in colour and many other properties, like reactivity. They do differ in optical properties: Khinite is biaxial (+), while parakhinite is uniaxial (−). They also have different unit cells.{{Cite journal|last1=Cooper|first1=M. A.|last2=Hawthorne|first2=F. C.|last3=Back|first3=M. E.|title=The crystal structure of khinite and polytypism in khinite and parakhinite|journal=Mineralogical Magazine|volume=72|issue=3|pages=763–770|doi=10.1180/minmag.2008.072.3.763|year=2008|bibcode=2008MinM...72..763C|s2cid=140537204}}{{Cite journal|last1=Hawthorne|first1=F. C.|last2=Cooper|first2=M. A.|last3=Back|first3=M. E.|title=Khinite-4O [= Khinite] and Khinite-3T [= Parakhinite]|journal=The Canadian Mineralogist|volume=47|issue=2|pages=473–476|doi=10.3749/canmin.47.2.473|year=2009|bibcode=2009CaMin..47..473H }}
References
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{{Selenites, selenates, tellurites, and tellurates}}
Category:Orthorhombic minerals