Mindat.org (original) (raw)

Locality type:

Village

Classification

Species:

'Orthopyroxene Subgroup' (not an IMA approved species)

Chemical Analyses:

Oxide wt%:

1
SiO2 53.39 %
Al2O3 5.44 %
Fe2O3 1.51 %
FeO 8.41 %
MnO 0.12 %
MgO 30.86 %
TiO2 0.10 %
Na2O 0.06 %
H2O+ 0.30 %
H2O- 0.04 %
Total: 100.23 %

Sample references:

1 - von Knorring, O., Sahama, Th.G., Lehtinen, M. (1969) Kornerupine-bearing gneiss from Inanakafy near Betroka, Madagascar. Bulletin of the Geological Society of Finland, 41. 79-84 doi:10.17741/bgsf/41.008

Comments:

The mineral represents a bronzite with (Fe, Mn): Mg = 15:85 and with Al largely substituting for Si.

Habit:

euhedral to subhedral crystals characterized by the pyramidal faces {211}. Faces {101} not visible.

Colour:

brownish

Confirmation

Validity:

Believed Valid

Data

Mineral Data:

Click here to view Orthopyroxene Subgroup data

Locality Data:

Click here to view Ianakafy (Inanakafy), Ianakafy, Betroka District, Anosy, Madagascar

Data Identifiers

Mindat Occurrence Record ID:

367040

Long-form Identifier:

1:3:367040:8

GUID (UUID V4):

e2eff076-1173-4145-ace0-18d9962e8e5f

Nearest other occurrences of Orthopyroxene Subgroup

68.7km (42.7 miles)

ⓘAnkafotia, Fotadrevo, Ampanihy District, Atsimo-Andrefana, Madagascar

References