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Rosasite

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Formula:
(Cu,Zn)2(CO3)(OH)2
System:
Monoclinic
Colour:
Blue, blue-green to ...
Hardness:
Member of:
Name:
Named in 1908 by Domenico Lovisato after its discovery locality, the Rosas Mine, Sulcis, Sardinia, Italy.
Rosasite Group.

Rosasite is a secondary mineral found in the oxidation zone of copper-zinc deposits. Cu:Zn ratio is near 3:2

Classification of Rosasite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
5.BA.10

5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
A : With Cu, Co, Ni, Zn, Mg, Mn
16a.3.1.2

16a : ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
3 : (AB)2(XO3)Zq
11.6.3

11 : Carbonates
6 : Carbonates of Zn and Cd
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First Recorded Occurrence of Rosasite

Place of Conservation of First Recorded Material:
Natural History Museum, Paris, France
Year of Discovery:
1908
Geological Setting of First Recorded Material:
In the oxidised zone of a Zn-Cu deposit.
Associated Minerals at First Recorded Locality:

Physical Properties of Rosasite

Vitreous, Silky
Diaphaneity (Transparency):
Translucent
Colour:
Blue, blue-green to green, sky-blue; colourless to light blue in transmitted light.
Streak:
Light blue
Hardness (Mohs):
Tenacity:
Brittle
Cleavage:
Distinct/Good
In two directions at right angles.
Density:
4 - 4.2 g/cm3 (Measured)    4.15 g/cm3 (Calculated)

Crystallography of Rosasite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 12.873(3) Å, b = 9.354(3) Å, c = 3.156(2) Å
β = 110.36(3)°
Ratio:
a:b:c = 1.376 : 1 : 0.337
Unit Cell Volume:
V 356.28 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Occurs as mammilary, botryoidal or veruginous crusts with a fibrous to spherulitic structure.
Twinning:
On {100}.
Comment:
Space group P21/a.
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Rosasite

Type:
Biaxial (-)
RI values:
nα = 1.672 - 1.688 nβ = 1.796 - 1.830 nγ = 1.811 - 1.831
2V:
Measured: 33° (5), Calculated: 36°
Max Birefringence:
δ = 0.139 - 0.143
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v strong
Pleochroism:
Strong
Comments:
X = Pale emerald green or Colourless
Y = Dark emerald green or Pale blue
Z = Dark emerald green or Pale blue

Chemical Properties of Rosasite

Formula:
(Cu,Zn)2(CO3)(OH)2
Essential elements:
All elements listed in formula:
Common Impurities:
Mg,Fe

Relationship of Rosasite to other Species

Member of:
Other Members of Group:
Glaukosphaerite(Cu,Ni)2(CO3)(OH)2
Mcguinnessite(Mg,Cu)2(CO3)(OH)2
ParádsasváriteZn2(CO3)(OH)2
PokrovskiteMg2(CO3)(OH)2
Zincrosasite(Zn,Cu)2(CO3)(OH)2
5.BA.05AzuriteCu3(CO3)2(OH)2
5.BA.10GeorgeiteCu2(CO3)(OH)2 · 6H2O
5.BA.10Glaukosphaerite(Cu,Ni)2(CO3)(OH)2
5.BA.10Kolwezite(Cu,Co)2(CO3)(OH)2
5.BA.10MalachiteCu2(CO3)(OH)2
5.BA.10Mcguinnessite(Mg,Cu)2(CO3)(OH)2
5.BA.10NullaginiteNi2(CO3)(OH)2
5.BA.10PokrovskiteMg2(CO3)(OH)2
5.BA.10Zincrosasite(Zn,Cu)2(CO3)(OH)2
5.BA.10ChukanoviteFe22+(CO3)(OH)2
5.BA.15Aurichalcite(Zn,Cu)5(CO3)2(OH)6
5.BA.15HydrozinciteZn5(CO3)2(OH)6
5.BA.20HoldawayiteMn6(CO3)2(OH)7(Cl,OH)
5.BA.25DeferniteCa6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (x<0.5)
5.BA.25UM1977-03-COSiO:CaClHCa10(SiO4)(CO3)7(Cl,OH)2
5.BA.30Loseyite(Mn2+,Zn,Mg)4Zn3(CO3)2(OH)10
5.BA.30Sclarite(Zn,Mg,Mn2+)4Zn3(CO3)2(OH)10
11.6.1SmithsoniteZnCO3
11.6.2HydrozinciteZn5(CO3)2(OH)6
11.6.4Zincrosasite(Zn,Cu)2(CO3)(OH)2
11.6.5Aurichalcite(Zn,Cu)5(CO3)2(OH)6
11.6.6Claraite(Cu,Zn)3(CO3)(OH)4 · 4H2O
11.6.7MinrecorditeCaZn(CO3)2
11.6.8Loseyite(Mn2+,Zn,Mg)4Zn3(CO3)2(OH)10
11.6.9Sclarite(Zn,Mg,Mn2+)4Zn3(CO3)2(OH)10
11.6.10OtaviteCdCO3

Other Names for Rosasite

Name in Other Languages:
German:Rosasit
Spanish:Rosasita

Other Information

Other Information:
Soluble in acids.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Rosasite

Reference List:
Lovisato (1908) Reale accademia nazionale dei Lincei, Rend. Rome: 17: 723.

Biehl (1921) Mineral Abstracts: 1: 202 (as Paraurichalcite-I).

Perrier (1921) Reale accademia nazionale dei Lincei, Rend., Rome: 30(5): 119.

Barth and Berman (1930) Chemie der Erde, Jena: 5: 22.

Lauro, C. (1937) Sulla presenza della parauricalcite I nella miniera di Rosas (Sulcis). Periodico di Mineralogia – Roma pp. 151-160.

Lauro, C. (1938) Periodico de Mineralogia-Roma: 9: 105.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 251-252.

Roberts, A. C., Jambor, J. L., Grice, J. D. (1986): The X-ray crystallography of rosasite from Tsumeb, Namibia. Powder Diffraction, 1, 56-57.

American Mineralogist (1987): 72: 1028.

Anthony, J.W., Bideaux, R.A., Bladh, K.W., and Nichols, M.C. (2003) Handbook of Mineralogy, Volume V. Borates, Carbonates, Sulfates. Mineral Data Publishing, Tucson, AZ, 813pp.: 596.

Perchiazzi, N. (2004). EPDIC European Powder diffraction conference Praha 2004, 11, 76.

Perchiazzi, N. (2006): Crystal structure determination and Rietveld refinement of rosasite and mcguinnessite. Zeitschrift für Kristallographie, Suppl. No. 23, 505-510. [http://www.atypon-link.com/OLD/doi/pdf/10.1524/zksu.2006.suppl_23.505]

Internet Links for Rosasite

Specimens:
The following Rosasite specimens are currently listed for sale on minfind.com.

Localities for Rosasite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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