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Andradite from
Antetezambato Demantoid-Topazolite Mine, Antsakoamanondro, Ambanja District, Diana, Madagascar


09548380017362114007349.jpg
Demantoid

Antetezambato Demantoid-Topazolite Mine, Antsakoamanondro, Ambanja District, Diana, Madagascar
09131040017272003404096.jpg
Demantoid

Antetezambato Demantoid-Topazolite Mine, Antsakoamanondro, Ambanja District, Diana, Madagascar
02204490017361183045563.jpg
Andradite

Antetezambato Demantoid-Topazolite Mine, Antsakoamanondro, Ambanja District, Diana, Madagascar
03043110017272003432876.jpg
Demantoid

Antetezambato Demantoid-Topazolite Mine, Antsakoamanondro, Ambanja District, Diana, Madagascar
03121470017362165993418.jpg
Demantoid

Antetezambato Demantoid-Topazolite Mine, Antsakoamanondro, Ambanja District, Diana, Madagascar
03018990017362864053238.jpg
Demantoid

Antetezambato Demantoid-Topazolite Mine, Antsakoamanondro, Ambanja District, Diana, Madagascar
02204490017361183045563.jpg
Andradite

Antetezambato Demantoid-Topazolite Mine, Antsakoamanondro, Ambanja District, Diana, Madagascar
08576770017496820698013.jpg
Demantoid

Antetezambato Demantoid-Topazolite Mine, Antsakoamanondro, Ambanja District, Diana, Madagascar
09045360017362165992931.jpg
Demantoid

Antetezambato Demantoid-Topazolite Mine, Antsakoamanondro, Ambanja District, Diana, Madagascar
09131040017272003404096.jpg
Demantoid

Antetezambato Demantoid-Topazolite Mine, Antsakoamanondro, Ambanja District, Diana, Madagascar
02204490017361183045563.jpg
Andradite

Antetezambato Demantoid-Topazolite Mine, Antsakoamanondro, Ambanja District, Diana, Madagascar
09937060017272003484754.jpg
Demantoid

Antetezambato Demantoid-Topazolite Mine, Antsakoamanondro, Ambanja District, Diana, Madagascar
Locality type:Mining Field
Classification
Species:Andradite
Formula:Ca3Fe23+(SiO4)3
Chemical Analyses:
Oxide wt%:
123
SiO234.90 %35.94 %35.52 %
TiO20.00 %0.01 %0.00 %
Al2O30.01 %0.08 %0.02 %
Fe2O331.54 %31.54 %31.23 %
MnO0.01 %0.01 %0.01 %
MgO0.08 %0.30 %0.06 %
CaO32.95 %33.38 %32.84 %
Na2O0.05 %0.00 %0.00 %
K2O0.02 %0.00 %0.00 %
Total:99.56 %101.26 %99.68 %
Sample references:
1 -
Pezzotta, Federico, Adamo, Ilaria, Diella, Valeria (2011) Demantoid and Topazolite from Antetezambato, Northern Madagascar: Review and New Data. Gems & Gemology, 47 (1) 2-14 doi:10.5741/gems.47.1.2
2 -
Pezzotta, Federico, Adamo, Ilaria, Diella, Valeria (2011) Demantoid and Topazolite from Antetezambato, Northern Madagascar: Review and New Data. Gems & Gemology, 47 (1) 2-14 doi:10.5741/gems.47.1.2
3 -
Pezzotta, Federico, Adamo, Ilaria, Diella, Valeria (2011) Demantoid and Topazolite from Antetezambato, Northern Madagascar: Review and New Data. Gems & Gemology, 47 (1) 2-14 doi:10.5741/gems.47.1.2
Comments:Yellowish green to green crystals from here are marketed as demantoid. The individual crystals are found in vugs and fissures in skarns and can become up to 3 cm in size.
Habit:Dominant dodecahedron combined with trapezohedron faces
Colour:Yellow, via yellowish green, green, brownish green to brown. The crystals are sometimes color zoned.
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Quartz2
Andradite2
- var Demantoid1
- var Topazolite1
Stilbite Subgroup1
Data
Mineral Data:Click here to view Andradite data
Locality Data:Click here to view Antetezambato Demantoid-Topazolite Mine, Antsakoamanondro, Ambanja District, Diana, Madagascar
Photo GalleryView Gallery (21 photos)
Data Identifiers
Mindat Occurrence Record ID:770950
Long-form Identifier:1:3:770950:0
GUID (UUID V4):0
Nearest other occurrences of Andradite
47.6km (29.6 miles) ⓘAmpasibitika, Antsirabe, Ambanja District, Diana, Madagascar
55.6km (34.5 miles) ⓘAmbohimirahavavy Alkaline Complex, Antsirabe, Ambanja District, Diana, Madagascar
80.2km (49.8 miles) ⓘAnkitsika Complex, Analalava District, Sofia, Madagascar
References
Pezzotta, Federico (2010) Andradite from Antetezambato, Madagascar. The Mineralogical Record, 41 (3) 209-229
Pezzotta, Federico, Adamo, Ilaria, Diella, Valeria (2011) Demantoid and Topazolite from Antetezambato, Northern Madagascar: Review and New Data. Gems & Gemology, 47 (1) 2-14 doi:10.5741/gems.47.1.2
Razafindratsimba, S. (2017) Le gisement de grenat demantoide d'Antetezambato, district d'Ambanja: Caracteristiques petrologiques et geochimiques. Master, Uiversitete d'Antananarivo. Antananarivo. 1-101
 
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