Coparsite

Cu2+4O2(AsO4)Cl
IMA status
  • Approved
IMA symbol
Cop
Also known as
  • Coparsiet
  • IMA1996-064
  • IMA1996-064a

Where it forms, where it's found

Geological setting

As sublimates near a volcanic fumarole ven

Type locality
Yadovitaya fumarole
  1. Second scoria cone
  2. Northern Breakthrough (North Breach)
  3. Great Fissure eruption (Main Fracture)
  4. Tolbachik Volcanic field
  5. Milkovsky District
  6. Kamchatka Krai
  7. Russia

55.8333°, 160.3333°

2recorded occurrences
Source · OpenStreetMap

Safety & handling

Physical

Lustre
Metallic
Transparency
Opaque
Colour
Black or dark gray
Streak
brown
Tenacity
very brittle
Cleavage
Perfect

(100)

Density
4.76 g/cm³

Optical

UV response
None

Crystallography

Crystal system
Orthorhombic
Space group
Pbcm
Cell parameters
a = 5.449(1) Å · b = 11.154(2) Å · c = 10.333(2) Å
Ratio a:b:c
1 : 2.047 : 1.896
Z
4
Type-locality form

Crystals, to 0.4 mm

Crystal structure

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
29CuCopperCopper463.546254.184
55.19%
8OOxygenOxygen615.99995.994
20.84%
33AsArsenicArsenic174.92274.922
16.27%
17ClChlorineChlorine135.45035.450
7.70%
Total460.550100.00%

Mass share = atoms × atomic mass ÷ molar mass × 100

From IMA formula

Synonyms

  • Coparsiet
  • IMA1996-064
  • IMA1996-064a

In other languages

German
Coparsit · IMA 1996-064 · IMA 1996-064a
Italian
Coparsite

Classification

Strunz
10th ed.

8.BE.80

  • 8Phosphates, Arsenates, VanadatesClass
  • 8.BPhosphates, etc., with additional anions, without H2ODivision
  • 8.BEWith only medium-sized cations, (OH, etc.):RO4 > 2:1Group
  • 8.BE.80CoparsiteSpecies

Literature, links & citation

Citations
  1. 1998Starova, G. L.; Krivovichev, S. V.; Filatov, S. K. (1998) Crystal chemistry of inorganic compounds based on chains of oxocentered tetrahedra. Zeitschrift für Kristallographie, 213 (12). 650-653 doi:10.1524/zkri.1998.213.12.650 DOI: 10.1524/zkri.1998.213.12.650
  2. 1999Vergasova, L.P., Starova, G.L., Krivovichev, S.V., Filatov, S.K., and Ananiev, V.V. (1999) Coparsite, Cu4O2[(As,V)O4]Cl, a new mineral species from the Tolbachik Volcano, Kamchatka Peninsula, Russia. The Canadian Mineralogist: 37: 911-914.
  3. 2020(2020) Coparsite. Handbook of Mineralogy. Mineralogical Society of America
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Coparsite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/coparsite-6889},
  note      = {Accessed 2026-05-11}
}