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Santanaite

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Formula:
Pb
 
11
(CrO
 
4
)O
 
12
System:HexagonalColour:Straw-yellow
Hardness:4
Name:Named after its discovery locality.


Needs restudy.

Classification of Santanaite

IMA status:Approved 1971
Strunz 8th edition ID:6/F.02-50
Nickel-Strunz 10th (pending) edition ID:7.FB.10

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
F : Chromates
B : With additional O,V, S, Cl
Dana 7th edition ID:35.4.1.1
Dana 8th edition ID:35.4.1.1

35 : ANHYDROUS CHROMATES
4 : Miscellaneous
Hey's CIM Ref.:27.2.7

27 : Sulphites, Chromates, Molybdates and Tungstates
2 : Chromates
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Type Occurrence of Santanaite

Type Locality:Santa Ana Mine, Caracoles, Sierra Gorda District, Antofagasta Province, Antofagasta Region, Chile

Physical Properties of Santanaite

Lustre:Adamantine
Colour:Straw-yellow
Hardness (Mohs):4
Density (calculated):9.155 g/cm3

Crystallography of Santanaite

Crystal System:Hexagonal
Class (H-M):6 2 2 - Trapezohedral
Space Group:P63 2 2
Cell Parameters:a = 9.03Å, c = 39.84Å
Ratio:a:c = 1 : 4.412
Unit Cell Volume:V 2,813.36 ų (Calculated from Unit Cell)
Z:6
X-Ray Powder Diffraction:
d-spacingIntensity
3.539 (100)
2.948 (40)
2.606 (80)
2.243 (40)
2.100 (40)
2.080 (50)
1.701 (50)

Optical Data of Santanaite

Type:Uniaxial (-)
RI values: nω = 2.320 nε = 2.120
Maximum Birefringence:δ = 0.200

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High

Chemical Properties of Santanaite

Formula:
Pb
 
11
(CrO
 
4
)O
 
12
Essential elements:Cr, O, Pb
All elements listed in formula:Cr, O, Pb

Relationship of Santanaite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.FB.05Phoenicochroite
Pb
 
2
(CrO
 
4
)O
7.FB.15Wattersite
(Hg
+
2
)
 
2
Hg
2+
 
(CrO
 
4
)O
 
2
7.FB.20Deanesmithite
(Hg
+
2
)Hg
2+
3
(CrO
 
4
)S
 
2
O
7.FB.25Edoylerite
Hg
2+
3
(CrO
 
4
)S
 
2
Related Minerals - Hey's Index Grouping:

- +
27.2.1Tarapacáite
K
 
2
[CrO
 
4
]
27.2.2Lópezite
K
 
2
[Cr
 
2
O
 
7
]
27.2.3Chromatite
Ca[CrO
 
4
]
27.2.4Hashemite
Ba(Cr,S)O
 
4
27.2.5Crocoite
Pb(CrO
 
4
)
27.2.6Phoenicochroite
Pb
 
2
(CrO
 
4
)O
27.2.8Iranite
Pb
 
10
Cu(CrO
 
4
)
 
6
(SiO
 
4
)
 
2
(F,OH)
 
2
27.2.9Hemihedrite
Pb
 
10
Zn(CrO
 
4
)
 
6
(SiO
 
4
)
 
2
(F,OH)
 
2
Related Minerals - Dana Grouping):

- +
35.4.1.1Wattersite
(Hg
+
2
)
 
2
Hg
2+
 
(CrO
 
4
)O
 
2

Other Names for Santanaite

Other Languages:
German:Santanait
Spanish:Santanaita

Other Information

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 Santanaite

Reference List:

- +
NJMM (1972): 455 [Am.Min.(1973): 58: 966 (abstract]

Internet Links for Santanaite

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    • Localities for Santanaite

    Hide Locality List
    (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
     
    • Antofagasta Region
      • Antofagasta Province
        • Sierra Gorda District
          • Caracoles
    		NJMM (1972), 455; HB3 (1997)
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