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Rosasite

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Formula:
(Cu,Zn)
 
2
(CO
 
3
)(OH)
 
2
System:MonoclinicColour:Blue, blue-green to ...
Hardness:
Member of:Rosasite Group
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

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:5/C.01-80
Nickel-Strunz 10th (pending) edition ID:5.BA.10

5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
A : With Cu, Co, Ni, Zn, Mg, Mn
Dana 8th edition ID:16a.3.1.2

16a : ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
3 : (AB)2(XO3)Zq
Hey's CIM Ref.:11.6.3

11 : Carbonates
6 : Carbonates of Zn and Cd
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Type Occurrence of Rosasite

Type Locality:Rosas Mine, Narcao, Carbonia-Iglesias Province, Sardinia, Italy
Place of Conservation of Type Material:Natural History Museum, Paris, France
Year of Discovery:1908
Geological Setting of type material:In the oxidised zone of a Zn-Cu deposit.
Associated Minerals at type locality:
SideriteMalachiteGreenockiteBrochantiteAurichalcite

Physical Properties of Rosasite

Lustre: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 (measured):4 - 4.2 g/cm3
Density (calculated):4.15 g/cm3

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:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data:
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°
Maximum Birefringence:δ = 0.139 - 0.143

Chart 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
(CO
 
3
)(OH)
 
2
Simplified for copy/paste:(Cu,Zn)2(CO3)(OH)2
Essential elements:C, Cu, H, O
All elements listed in formula:C, Cu, H, O, Zn
Common Impurities:Mg,Fe

Relationship of Rosasite to other Species

Member of:Rosasite Group
Other Members of Group:

- +
Glaukosphaerite
(Cu,Ni)
 
2
(CO
 
3
)(OH)
 
2
Mcguinnessite
(Mg,Cu)
 
2
(CO
 
3
)(OH)
 
2
Parádsasvárite
Zn
 
2
(CO
 
3
)(OH)
 
2
Pokrovskite
Mg
 
2
(CO
 
3
)(OH)
 
2
Zincrosasite
(Zn,Cu)
 
2
(CO
 
3
)(OH)
 
2
Related Minerals - Nickel-Strunz Grouping):

- +
5.BA.05Azurite
Cu
 
3
(CO
 
3
)
 
2
(OH)
 
2
5.BA.10Georgeite
Cu
 
2
(CO
 
3
)(OH)
 
2
· 6H
 
2
O
5.BA.10Glaukosphaerite
(Cu,Ni)
 
2
(CO
 
3
)(OH)
 
2
5.BA.10Kolwezite
(Cu,Co)
 
2
(CO
 
3
)(OH)
 
2
5.BA.10Malachite
Cu
 
2
(CO
 
3
)(OH)
 
2
5.BA.10Mcguinnessite
(Mg,Cu)
 
2
(CO
 
3
)(OH)
 
2
5.BA.10Nullaginite
Ni
 
2
(CO
 
3
)(OH)
 
2
5.BA.10Pokrovskite
Mg
 
2
(CO
 
3
)(OH)
 
2
5.BA.10Zincrosasite
(Zn,Cu)
 
2
(CO
 
3
)(OH)
 
2
5.BA.10Chukanovite
Fe
2+
2
(CO
 
3
)(OH)
 
2
5.BA.15Aurichalcite
(Zn,Cu)
 
5
(CO
 
3
)
 
2
(OH)
 
6
5.BA.15Hydrozincite
Zn
 
5
(CO
 
3
)
 
2
(OH)
 
6
5.BA.20Holdawayite
Mn
 
6
(CO
 
3
)
 
2
(OH)
 
7
(Cl,OH)
5.BA.25Defernite
Ca
 
6
(CO
 
3
)
 
2-x
(SiO
 
4
)
 
x
(OH)
 
7
(Cl,OH)
 
1-2x
(x<0.5)
5.BA.25UM1977-03-COSiO:CaClH
Ca
 
10
(SiO
 
4
)(CO
 
3
)
 
7
(Cl,OH)
 
2
5.BA.30Loseyite
(Mn
2+
 
,Zn,Mg)
 
4
Zn
 
3
(CO
 
3
)
 
2
(OH)
 
10
5.BA.30Sclarite
(Zn,Mg,Mn
2+
 
)
 
4
Zn
 
3
(CO
 
3
)
 
2
(OH)
 
10
Related Minerals - Hey's Index Grouping:

- +
11.6.1Smithsonite
ZnCO
 
3
11.6.2Hydrozincite
Zn
 
5
(CO
 
3
)
 
2
(OH)
 
6
11.6.4Zincrosasite
(Zn,Cu)
 
2
(CO
 
3
)(OH)
 
2
11.6.5Aurichalcite
(Zn,Cu)
 
5
(CO
 
3
)
 
2
(OH)
 
6
11.6.6Claraite
(Cu,Zn)
 
3
(CO
 
3
)(OH)
 
4
· 4H
 
2
O
11.6.7Minrecordite
CaZn(CO
 
3
)
 
2
11.6.8Loseyite
(Mn
2+
 
,Zn,Mg)
 
4
Zn
 
3
(CO
 
3
)
 
2
(OH)
 
10
11.6.9Sclarite
(Zn,Mg,Mn
2+
 
)
 
4
Zn
 
3
(CO
 
3
)
 
2
(OH)
 
10
11.6.10Otavite
CdCO
 
3

Other Names for Rosasite

Synonyms:
Parauricalcite-I
Other Languages:
German:Rosasit
Simplified Chinese:锌孔雀石
Spanish:Rosasita
Varieties:
Nickeloan Rosasite

Other Information

Other Information:Soluble in acids.
Health Warning: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 [Link Broken? Aug 2014]]

Internet Links for Rosasite

Search Engines:
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  • External Links:
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  • Look for Rosasite on Athena Mineralogy
  • Look for Rosasite on Wikipedia
  • Look for Rosasite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Rosasite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Search for Rosasite on Well-Arranged Molecules
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  • Find Rosasite on www.crystalclassics.co.uk
  • Lapis Mineral Magazin
  • Specimens:The following Rosasite specimens are currently listed for sale on minfind.com.

    Localities for Rosasite

    The 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.
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