utahite

{{Short description|Extremely rare secondary copper zinc tellurate mineral}}

{{Infobox mineral

| name = Utahite

| boxwidth =

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| image = Jarosite-Natrojarosite-pas-129a.jpg

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| caption = Utahite and jarosite

| category = Tellurate minerals

| formula = Cu₅Zn₃(Te⁶⁺O₄)₄(OH)₈·7H₂O

| IMAsymbol = Uta{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|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 = 1,542.46 g/mol

| strunz = 7.DE.25

| dana =

| system = Triclinic
Unknown space group

| unit cell = a = 8.794 Å, b = 9.996 Å
c = 5.66 Å; α = 104.1°
β = 90.066°, γ = 96.3333°; Z = 1

| color = Pale blue, greenish blue

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| habit = Prismatic thin tabular to bladed crystals; as sheaves and bow tielike clusters

| twinning =

| cleavage = none

| fracture = Brittle – uneven

| tenacity =

| mohs = 4–5

| luster = Vitreous to pearly

| streak = Pale blue

| diaphaneity = Translucent

| gravity = 5.33

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| opticalprop = Biaxial

| refractive = n_α = 1.830 – 1.840 n_β = 1.830 – 1.900 n_γ = 1.880 – 1.900

| birefringence = δ = 0.050 – 0.060

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| dispersion = Strong

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| references = [http://webmineral.com/data/Utahite.shtml Utahite], Webmineral.com[http://www.mindat.org/min-7348.html Utahite], Mindat.org[http://rruff.geo.arizona.edu/doclib/hom/utahite.pdf Handbook of Mineralogy]

}}

Utahite is an extremely rare secondary copper zinc tellurate mineral found as a product of oxidation. Its chemical formula is Cu₅Zn₃(Te⁶⁺O₄)₄(OH)₈·7H₂O.

It was first described in 1997 for an occurrence in the Centennial Eureka mine, one mile southeast of Eureka, Tintic District, Juab County, Utah, US (type locality). The discovery site was a mine dump of a hydrothermal ore deposit where it occurs with cesbronite and quartz. It has also been reported from the Empire Mine in the Tombstone District of Cochise County, Arizona.