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Cuproroméite
A discredited species name
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About Cuproroméite
Formula:
Cu2Sb2(O,OH)7
Colour:
Olive-green, yellowish-green, blackish-green, tarnishes black
Hardness:
3 - 4
Specific Gravity:
2.98 - 3.96
Crystal System:
Isometric
Member of:
Name:
Named for the chemical relation to roméite. Originally named for August F. W. Partz, who first recognized the mineral as a silver ore.
Originally named partzite.
Generally found as a olive-greenish, fine-grained weathering product of Sb-bearing fahlore.
Note, however, that such weathering products can also be X-ray amorphous.
Partzite discredited in IMA proposal: 16-B. Found to be a very fined grained mixture of a plumboroméite-like oxide phase and a chrysocolla-like amorphous Cu silicate.
Generally found as a olive-greenish, fine-grained weathering product of Sb-bearing fahlore.
Note, however, that such weathering products can also be X-ray amorphous.
Partzite discredited in IMA proposal: 16-B. Found to be a very fined grained mixture of a plumboroméite-like oxide phase and a chrysocolla-like amorphous Cu silicate.
Name Encoding
ASCII-7:
Cuproromeite
Unique Identifiers
Mindat ID:
3128
Long-form identifier:
mindat:1:1:3128:4
IMA Classification of Cuproroméite
Discredited
First published:
1867
Classification of Cuproroméite
4.DH.20
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
H : With large (+- medium-sized) cations; sheets of edge-sharing octahedra
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
H : With large (+- medium-sized) cations; sheets of edge-sharing octahedra
44.1.1.7
44 : ANTIMONATES
1 : A2X2O6(O,OH,F)
44 : ANTIMONATES
1 : A2X2O6(O,OH,F)
24.1.3
24 : Antimonates and Antimonites
1 : Antimonates and antimonites of Na, Cu or Ag
24 : Antimonates and Antimonites
1 : Antimonates and antimonites of Na, Cu or Ag
Physical Properties of Cuproroméite
Transparency:
Translucent
Colour:
Olive-green, yellowish-green, blackish-green, tarnishes black
Hardness:
3 - 4 on Mohs scale
Fracture:
Conchoidal
Density:
2.98 - 3.96 g/cm3 (Measured) 5.5 g/cm3 (Calculated)
Optical Data of Cuproroméite
Type:
Isotropic
RI values:
n = 1.61 - 1.82
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Chemistry of Cuproroméite
Mindat Formula:
Cu2Sb2(O,OH)7
Element Weights:
Elements listed:
Crystallography of Cuproroméite
Crystal System:
Isometric
Cell Parameters:
a = 10.25 Å
Unit Cell V:
1,076.89 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Massive
Comment:
Space group not determined.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.91 Å | (9) |
| 3.08 Å | (7) |
| 2.95 Å | (10) |
| 2.56 Å | (5) |
| 1.81 Å | (8) |
| 1.73 Å | (4) |
| 1.54 Å | (7) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| 47h : [Near-surface oxidized, dehydrated minerals] |
First Recorded Occurrence of Cuproroméite
Place of Conservation of First Recorded Material:
Harvard University, Boston, Mass. 80284, 80279
Other Language Names for Cuproroméite
German:Cuproroméit
Partzit
Partzit
Spanish:Partzita
Relationship of Cuproroméite to other Species
Member of:
Other Members of Roméite Group:
| Bismutostibiconite | (Bi,Fe3+,◻)2Sb5+2O7 | Iso. m3m(4/m32/m) : Fd3m |
| Fluorcalcioroméite | (Ca,Na,◻)2Sb5+2(O,OH)6F | Iso. m3m(4/m32/m) : Fd3m |
| Hydroxycalcioroméite | (Ca,Sb3+)2(Sb5+,Ti)2O6(OH) | Iso. m3m(4/m32/m) : Fd3m |
| Hydroxyferroroméite | (Fe2+1.5◻0.5)Sb5+2O6(OH) | Iso. m3m(4/m32/m) : Fd3m |
| Oxycalcioroméite | Ca2Sb2O6O | Iso. m3m(4/m32/m) : Fd3m |
| Oxyplumboroméite | Pb2Sb2O6O | Iso. m3m(4/m32/m) : Fd3m |
| Stibiconite | Sb3+Sb5+2O6(OH) | Iso. m3m(4/m32/m) : Fd3m |
Tereksai, Chatkal district, Jalal-Abad Region, Kyrgyzstan