Santarosaite Mineral Data

General Santarosaite Information

Chemical Formula:

CuB2O4

Composition:

Molecular Weight = 149.03 gm

Calcium 1.34 % Ca 1.88 % CaO

Copper 36.67 % Cu 45.90 % CuO

Boron 14.87 % B 47.88 % B₂O₃

Lead 4.17 % Pb 4.49 % PbO

Oxygen 42.94 % O

______ ______

100.00 % 100.16 % = TOTAL OXIDE

Empirical Formula:

Cu_0.86Pb_0.03Ca_0.05B_2.05O₄

Environment:

From the oxidation zone of a polymetallic (silver, copper, lead) ore deposit. Natural analogue of copper metaborate.

IMA Status:

Approved IMA 2007 (Dana # Added)

Locality:

Mina Santa Rosa, Iquique, Northern Chile. Link to MinDat.org Location Data.

Name Origin:

Named for the mine which was named after St. Rose of Lima (1586-1617), first Catholic American saint.

Synonym:

IMA2007-013

Santarosaite Image

Images:

Santarosaite

Comments: Druzy rosettes of blue santarosaite on matrix.
Location: Santa Rosa mine, Iquique Province, Chile. Scale: Rosette Size 0.3 mm.
© Tom Loomis / Dakota Matrix

Images:

Santarosaite Atacamite

Comments: Encrustations of santarosaite (Cotype Specimen, MD212; blue) with atacamite (green) and anhydrite (white) on matrix. Discovered by Arturo Molina, Iquique, Chile in 2003. Holotype, sample MD 87, largely used up for the examinations.
Location: Santa Rosa Mine, Iquique, Chile. Scale: Sample Width 3 cm.
© K.C. Lyncker, Hamburg / German Type Specimen Catalogue

Santarosaite Crystallography

Axial Ratios:

a:c = 1:0.48901

Cell Dimensions:

a = 11.517, c = 5.632, Z = 12; V = 747.04 Den(Calc)= 3.97

Crystal System:

Tetragonal - Scalenohedral H-M Symbol (4 2m) Space Group: I 42d;

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

By Intensity(I/I_o): 3.797(1), 3.638(0.47), 2.775(0.35),2.501(0.26), 2.572(0.26), 1.822(0.21), 1.793(0.2), 2.876(0.17),

Physical Properties of Santarosaite

Color:

Vivid blue.

Diaphaneity:

Translucent

Habit:

Globular - Spherical, or nearly so, rounded forms (e.g. wavellite).

Streak:

pale blue

Optical Properties of Santarosaite

Optical Data:

Uniaxial (?).

NCalc= 1.76 - from Gladstone-Dale relationship (KC = 0.1909) where Ncalc=Dcalc*KC+1

Calculated Properties of Santarosaite

Electron Density:

Bulk Density (Electron Density)=3.76 gm/cc
note: Specific Gravity of Santarosaite =3.97 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Santarosaite= 84.15 barns/electron
U=PE_Santarosaite x rElectron Density= 316.74 barns/cc.

Radioactivity:

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

Santarosaite Classification

Dana Class:

24.05.02.02 (24)Borates - Anhydrous

(24.05)with miscellaneous formulae

(24.05.02)Dana Group

24.05.02.01 Calciborite CaB2O4 Pccn 2/m 2/m 2/m

24.05.02.02 Santarosaite! CuB2O4 I 42d; 4 2m

Strunz Class:

06.BD.05 06 - BORATES

06.B - Diborates

06.BD -Tektodiborates with tetrahedra

06.BD.05 Santarosaite! CuB2O4 I 42d; 4 2m

Other Santarosaite Information

References:

NAME( AmMin, v93:402) PHYS. PROP.(AmMin, v93:402) OPTIC PROP.(AmMin, v93:402)

See Also:

Links to other databases for Santarosaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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

Santarosaite

CuB2O4
Dana No: 24.05.02.02 Strunz No: 06.BD.05
Locality:

Notes:

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