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Rosasite

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Formula:
(Cu,Zn)2(CO3)(OH)2
Colour:
Blue, blue-green to green, sky-blue; colourless to light blue in transmitted light.
Lustre:
Vitreous, Silky
Hardness:
Specific Gravity:
4 - 4.2
Crystal System:
Monoclinic
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

Approved, 'Grandfathered' (first described prior to 1959)
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

Physical Properties of Rosasite

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

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
IMA Formula:
CuZnCO3(OH)2
Common Impurities:
Mg,Fe

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 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.

Type Occurrence of Rosasite

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

Synonyms of Rosasite

Other Language Names for Rosasite

German:Rosasit
Spanish:Rosasita

Varieties of Rosasite

Relationship of Rosasite to other Species

Member of:
Other Members of this group:
ChukanoviteFe2+2(CO3)(OH)2
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

Common Associates

Associated Minerals Based on Photo Data:
Hemimorphite225 photos of Rosasite associated with Hemimorphite on mindat.org.
Calcite177 photos of Rosasite associated with Calcite on mindat.org.
Smithsonite155 photos of Rosasite associated with Smithsonite on mindat.org.
Cerussite107 photos of Rosasite associated with Cerussite on mindat.org.
Malachite97 photos of Rosasite associated with Malachite on mindat.org.
Quartz92 photos of Rosasite associated with Quartz on mindat.org.
Aurichalcite84 photos of Rosasite associated with Aurichalcite on mindat.org.
Azurite78 photos of Rosasite associated with Azurite on mindat.org.
Conichalcite42 photos of Rosasite associated with Conichalcite on mindat.org.
Dolomite42 photos of Rosasite associated with Dolomite on mindat.org.

Related Minerals - Nickel-Strunz Grouping

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.10ChukanoviteFe2+2(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:CaClHCa10-11(CO3)7(SiO4)Cl1-2(OH)1-2
5.BA.30Loseyite(Mn2+,Zn,Mg)4Zn3(CO3)2(OH)10
5.BA.30Sclarite(Zn,Mg,Mn2+)4Zn3(CO3)2(OH)10

Related Minerals - Hey's Chemical Index of Minerals Grouping

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)15(CO3)4(AsO4)2(SO4)(OH)14·7H2O
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

Related Minerals - Dana Grouping (8th Ed.)

16a.3.1.1MalachiteCu2(CO3)(OH)2
16a.3.1.3Glaukosphaerite(Cu,Ni)2(CO3)(OH)2
16a.3.1.4Mcguinnessite(Mg,Cu)2(CO3)(OH)2
16a.3.1.4Zincrosasite(Zn,Cu)2(CO3)(OH)2
16a.3.1.5PokrovskiteMg2(CO3)(OH)2
16a.3.1.7Kolwezite(Cu,Co)2(CO3)(OH)2

Other Information

Notes:
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:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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: 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.
Hawthorne, F.C. (1987) New Mineral Names. American Mineralogist: 72: 1028.
Anthony, J.W., Bideaux, R.A., Bladh, K.W., 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

mindat.org URL:
https://www.mindat.org/min-3447.html
Please feel free to link to this page.
Specimens:
The following Rosasite specimens are currently listed for sale on minfind.com.

Localities for Rosasite

Mineral and/or Locality  
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