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Magnesio-hornblende from
Engebøfjellet Eclogite Deposit, Naustdal, Sunnfjord, Vestland, Norway


Locality type:Deposit
Classification
Species:Magnesio-hornblende
Formula:◻Ca2(Mg4Al)(Si7Al)O22(OH)2
Formation:Secondary
Chemical Analyses:
Oxide wt%:
1
SiO248.15 %
TiO20.30 %
Al2O310.22 %
MnO0.18 %
FeO10.66 %
MgO14.28 %
CaO11.51 %
Na2O1.59 %
K2O0.29 %
Total:97.18 %
Empirical formulas:
1(Na0.283K0.053)Σ0.336 (Ca1.775Na0.16Fe0.043Mn0.022)Σ2 (Mg3.064Fe2+1.01Al0.663Fe3+0.23Ti0.032)Σ4.999 (Si6.93Al1.07)Σ8 O22 ((OH)1.935O0.065)Σ2
Sample references:
1E11
Braathen, Alvar, Erambert, Muriel (2014) Structural and metamorphic history of the Engebøfjellet Eclogite and the exhumation of the Western Gneiss Region, Norway. Norwegian Journal of Geology - Norsk Geologisk Tidsskrift, 94 (1) 53-76
Comments:Retrograde amphibole as rims on clinopyroxene
Quality for species:Rock forming mineral/non-crystalline/little interest for collectors.(##)
Confirmation
Validity:Confirmed
Confirmation Methods:EPMA
Data
Mineral Data:Click here to view Magnesio-hornblende data
Locality Data:Click here to view Engebøfjellet Eclogite Deposit, Naustdal, Sunnfjord, Vestland, Norway
Data Identifiers
Mindat Occurrence Record ID:1472290
Long-form Identifier:1:3:1472290:5
GUID (UUID V4):0
References
Braathen, Alvar, Erambert, Muriel (2014) Structural and metamorphic history of the Engebøfjellet Eclogite and the exhumation of the Western Gneiss Region, Norway. Norwegian Journal of Geology - Norsk Geologisk Tidsskrift, 94 (1) 53-76
 
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