Rosasite Mineral Data

General Rosasite Information

Chemical Formula:

(Cu,Zn)2(CO3)(OH)2

Composition:

Molecular Weight = 222.04 gm

Zinc 14.72 % Zn 18.33 % ZnO

Copper 42.93 % Cu 53.74 % CuO

Hydrogen 0.91 % H 8.11 % H₂O

Carbon 5.41 % C 19.82 % CO₂

Oxygen 36.03 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu_1.5Zn_0.5(CO₃)(OH)₂

IMA Status:

Valid Species (Pre-IMA) 1908

Locality:

Rosas mine, Narcao, Cagliari, Sardegna (Sardinia), Italy. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Name Pronunciation:

Rosasite

Rosasite Image

Images:

Rosasite

Comments: Rosasite on malachite after azurite. Blocky crystals of azurite to 2.5 cm in size, completely altered to malachite, then coated by pale sky-blue rosasite.
Location: Silver Bill mine, Gleeson, Cochise Co., Arizona, USA. Scale: 4 x 7.5 x 2 cm.
© Dan Weinrich

Rosasite Crystallography

Axial Ratios:

a:b:c =1.3762:1:0.3373

Cell Dimensions:

a = 12.873, b = 9.354, c = 3.156, Z = 4; beta = 110.36° V = 356.28 Den(Calc)= 4.14

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.708(1), 5.094(0.8), 2.601(0.7),

Physical Properties of Rosasite

Cleavage:

{010} Perfect, {100} Perfect

Color:

Blue green, Light blue, Sky blue.

Density:

4 - 4.2, Average = 4.09

Diaphaneity:

Transparent to Translucent

Fracture:

Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Mammillary - Larger "breast-like" rounded forms resembling botryoidal (e.g. malachite).

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

4 - Fluorite

Luster:

Vitreous - Silky

Streak:

light blue

Optical Properties of Rosasite

Gladstone-Dale:

CI meas= 0.001 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1877,KPDmeas= 0.1895,KC= 0.1897
Ncalc = 1.76 - 1.8

Optical Data:

Biaxial (-), a=1.672, b=1.829, g=1.83, bire=0.1580, 2V(Calc)=8, 2V(Meas)=0-5.

Calculated Properties of Rosasite

Electron Density:

Bulk Density (Electron Density)=3.93 gm/cc
note: Specific Gravity of Rosasite =4.10 gm/cc.

Fermion Index:

Fermion Index = 0.0068065726
Boson Index = 0.9931934274

Photoelectric:

PE_Rosasite= 26.27 barns/electron
U=PE_Rosasite x rElectron Density= 103.34 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rosasite is Not Radioactive

Rosasite Classification

Dana Class:

16a.03.01.01 (16a)Carbonates - Hydroxyl or Halogen

(16a.03)where (A B)2 (XO3) Zq

(16a.03.01)Rosasite Group

16a.03.01.01 Rosasite (Cu,Zn)2(CO3)(OH)2 P 2₁/a 2/m

16a.03.01.02 Glaukosphaerite (Cu,Ni)2(CO3)(OH)2 P 2₁/a 2/m

16a.03.01.03 Kolwezite (Cu,Co)2(CO3)(OH)2 P1 or P1 Tri

16a.03.01.04 Zincrosasite (Zn,Cu)2(CO3)(OH)2 P 2₁/a 2/m

16a.03.01.05 Mcguinnessite (Mg,Cu)2(CO3)(OH)2 P 2/a or P 2₁/a 2/m

Strunz Class:

05.BA.10 05 - CARBONATES (NITRATES)

05.B - Carbonates with additional anions, without H2O

05.BA -With Cu, Co, Ni, Zn, Mg, Mn

05.BA.10 Nullaginite Ni2(CO3)(OH)2 P 2₁/m,P 2₁ Mono

05.BA.10 Georgeite Cu5(CO3)3(OH)4•6(H2O) None

05.BA.10 Malachite Cu2(CO3)(OH)2 P 2₁/a 2/m

05.BA.10 Glaukosphaerite (Cu,Ni)2(CO3)(OH)2 P 2₁/a 2/m

05.BA.10 Mcguinnessite (Mg,Cu)2(CO3)(OH)2 P 2/a or P 2₁/a 2/m

05.BA.10 Kolwezite (Cu,Co)2(CO3)(OH)2 P1 or P1 Tri

05.BA.10 Pokrovskite Mg2(CO3)(OH)2•0.5(H2O) P 2₁/a 2/m

05.BA.10 Rosasite (Cu,Zn)2(CO3)(OH)2 P 2₁/a 2/m

05.BA.10 Zincrosasite (Zn,Cu)2(CO3)(OH)2 P 2₁/a 2/m

05.BA.10 Chukanovite! Fe2(CO3)(OH)2 P 2₁/a 2/m

Other Rosasite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Rosasite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - Franklin Minerals(Dunn)
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - YupRocks

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Print or Cut-and-Paste your Rosasite Specimen Label here :

Rosasite

(Cu,Zn)2(CO3)(OH)2
Dana No: 16a.03.01.01 Strunz No: 05.BA.10
Locality:

Notes:

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