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Magnesio-hastingsite from
Deeti volcanic cone, Monduli District, Arusha Region, Tanzania


Locality type:Volcanic Cone
Classification
Species:Magnesio-hastingsite
Formula:NaCa2(Mg4Fe3+)(Si6Al2)O22(OH)2
Comments:The mineral occurs as megacrysts up to 12 cm in size in crystal-rich tuff. Zaitsev et al. (2013) publish the following empirical formula (Na0.68K0.32)ÎĢ1.00(Ca1.88Na0.12Mn0.02)ÎĢ2.03(Mg2.92Fe2+0.98Fe3+0.55Ti0.49Al0.12)ÎĢ5.06(Al1.97Si6.03O22)(O0.70OH1.30)ÎĢ2.00
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Magnesio-hastingsite data
Locality Data:Click here to view Deeti volcanic cone, Monduli District, Arusha Region, Tanzania
Data Identifiers
Mindat Occurrence Record ID:902406
Long-form Identifier:1:3:902406:9
GUID (UUID V4):0
Nearest other occurrences of Magnesio-hastingsite
35.1km (21.8 miles) ⓘMosonik Volcano, Ngorongoro District, Arusha region, Tanzania
References
Zaitsev, A. N., Avdontseva, E. Yu., Britvin, S. N., DemÃĐny, A., Homonnay, Z., Jeffries, T. E., Keller, J., Krivovichev, V. G., Markl, G., Platonova, N. V., Siidra, O. I., Spratt, J., Vennemann, T. (2013) Oxo-magnesio-hastingsite, NaCa2(Mg2Fe3+3 )(Al2Si6)O22O2, a new anhydrous amphibole from the Deeti volcanic cone, Gregory rift, northern Tanzania. Mineralogical Magazine, 77 (6) 2773-2792 doi:10.1180/minmag.2013.077.6.06
 
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