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Santarosaite

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Santa Rosa Mine, Santa Rosa-Huantajaya District, Iquique Province, Tarapacá Region, Chile
© Elmar Lackner

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Formula:
CuB
 
2
O
 
4
System:TetragonalColour:vivid blue
Name:For the type locality, Santa Rosa Mine, Iquique, Chile


The natural analogue of copper metaborate.

Classification of Santarosaite

IMA status:Approved 2007
Nickel-Strunz 10th (pending) edition ID:6.BD.05

6 : BORATES
B : Diborates
D : Tektodiborates with tetrahedra
Dana 8th edition ID:24.5.5.

24 : ANHYDROUS BORATES
5 : Miscellaneous
mindat.org URL:http://www.mindat.org/min-29030.html
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Type Occurrence of Santarosaite

Type Locality:Santa Rosa Mine, Santa Rosa-Huantajaya District, Iquique Province, Tarapacá Region, Chile
General Appearance of Type Material:globules to 60 microns in size
Place of Conservation of Type Material:Mineralogical Museum of the University of Hamburg, Germany
Year of Discovery:2003
Associated Minerals at type locality:
WulfeniteMalachiteAtacamiteAnhydrite

Physical Properties of Santarosaite

Lustre:Vitreous
Colour:vivid blue
Streak:pale blue
Density (calculated):3.96 g/cm3

Crystallography of Santarosaite

Crystal System:Tetragonal
Class (H-M):4 2m - Scalenohedral
Space Group:I4 2d
Cell Parameters:a = 11.517(8) Å, c = 5.632(6) Å
Ratio:a:c = 1 : 0.489
Unit Cell Volume:V 747.1 ų
Z:12
Morphology:globular aggregates of tiny leaf-like crystallites less than 1 micron thick.
X-Ray Powder Diffraction:
d-spacingIntensity
3.707 (100)
3.638 (47)
2.876 (17)
2.775 (35)
2.572 (26)
2.501 (26)
1.822 (21)
1.793 (20)

Chemical Properties of Santarosaite

Formula:
CuB
 
2
O
 
4
All elements listed in formula:B, Cu, O
Analytical Data:Average of 15 analyses (electron microprobe). The low total is assumed to originate from structural reasons (the very small size of the crystallites) and not "analytical failures".
CuO (43.24)
PbO (4.48)
CaO (0.97)
B203 (45.44)
Total (94.13)
Common Impurities:Pb,Ca

Other Names for Santarosaite

Synonyms:
IMA2007-013
Other Languages:

Other Information

Fluorescence in UV light:not observed
Other Information:not soluble in water, but in HCl
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 Santarosaite

Reference List:

- +
Schlüter, J., Pohl, D., Golla-Schindler, U. (2008): Santarosaite, CuB2O4, a new mineral with disordered structure from the Santa Rosa mine, Atacama desert, Chile. Neues Jahrbuch für Mineralogie - Abhandlungen, 185, 27-32.

Internet Links for Santarosaite

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    • Localities for Santarosaite

    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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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Chile
     
    • Tarapacá Region
      • Iquique Province
        • Santa Rosa-Huantajaya District
    		Schlüter, J., Pohl, D., Golla-Schindler, U. (2008): Santarosaite, CuB2O4, a new mineral with disordered structure from the Santa Rosa mine, Atacama desert, Chile. Neues Jahrbuch für Mineralogie - Abhandlungen, 185, 27-32.
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