Rosasite Mineral Data

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.

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 - PrismaticH-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

Diaphaniety:

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

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:

r_electron=3.93 gm/cc
note: r_Rosasite=4.10 gm/cc.

Fermion Index

Fermion Index = 0.0068
Boson Index = 0.9932

Photoelectric:

PE_Rosasite= 26.27 barns/electron
U=PE_Rosasite x r_electron= 103.34 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Rosasite is Not Radioactive

Rosasite Classification

Dana Class:

16a.3.1.1 (16a)Carbonates - Hydroxyl or Halogen

(16a.3)where (A B)2 (XO3) Zq

(16a.3.1)Rosasite Group

16a.3.1.1 Rosasite (Cu,Zn)2(CO3)(OH)2 P 2₁/a 2/m

16a.3.1.2 Glaukosphaerite (Cu,Ni)2(CO3)(OH)2 P 2₁/a 2/m

16a.3.1.3 Kolwezite (Cu,Co)2(CO3)(OH)2 P1 or P1 Tri

16a.3.1.4 Zincrosasite (Zn,Cu)2(CO3)(OH)2 P 2₁/a 2/m

16a.3.1.5 Mcguinnessite (Mg,Cu)2(CO3)(OH)2 P 2/a or P 2₁/a 2/m

Strunz Class:

V/C.01-80 V - Nitrates, Carbonates and Borates

V/C - Waterfree carbonates with unfamiliar anions

V/C.01 - Azurite - Rosasite group and related compounds

V/C.01-10 Azurite Cu3(CO3)2(OH)2 P 2₁/a 2/m

V/C.01-20 Malachite Cu2(CO3)(OH)2 P 2₁/a 2/m

V/C.01-25 Georgeite Cu5(CO3)3(OH)4·6(H2O) None

V/C.01-30 Pokrovskite Mg2(CO3)(OH)2·0.5(H2O) P 2₁/a 2/m

V/C.01-40 Mcguinnessite (Mg,Cu)2(CO3)(OH)2 P 2/a or P 2₁/a 2/m

V/C.01-50 Kolwezite (Cu,Co)2(CO3)(OH)2 P1 or P1 Tri

V/C.01-60 Glaukosphaerite (Cu,Ni)2(CO3)(OH)2 P 2₁/a 2/m

V/C.01-70 Nullaginite Ni2(CO3)(OH)2 P 2₁/m,P 2₁ Mono

V/C.01-80 Rosasite (Cu,Zn)2(CO3)(OH)2 P 2₁/a 2/m

V/C.01-90 Zincrosasite (Zn,Cu)2(CO3)(OH)2 P 2₁/a 2/m

V/C.01-100 Hydrozincite Zn5(CO3)2(OH)6 C 2/m 2/m

V/C.01-105 Brianyoungite Zn3(CO3,SO4)(OH)4 C 2/m 2/m

V/C.01-110 Aurichalcite (Zn,Cu)5(CO3)2(OH)6 P 2₁/m 2/m

V/C.01-120 Loseyite (Mn,Zn)7(CO3)2(OH)10 A2/a 2/m

V/C.01-130 Sclarite (Zn,Mg,Mn)4Zn3(CO3)2(OH)10 A2/a 2/m

Other Rosasite Information

References:

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

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Rosasite

(Cu,Zn)2(CO3)(OH)2
Dana No: 16a.3.1.1 Strunz No: V/C.01-80
Locality:

Notes: