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UM1983-18-SiO:AlFeHMg

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Formula:
~(Mg,Fe)Al4Si4O12(OH)8
Colour:
pale yellow in thin section
Reported as "Unnamed hydrous Fe-Mg-aluminosilicate". Compositionally similar to magnesiocarpholite.

Product of cordierite alteration. A composition similar to the given one was also obtained for a phase formed likely in expense of a cordierite that replaced biotite.

Beside cordierite the associated phases are almandine, biotite, corundum, hematite, hercynite, ilmenite, magnetite, Na-rich plagioclase, orthoclase (incl. a microperthite), quartz, and sillimanite.



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Unique IdentifiersHide

Mindat ID:
47739
Long-form identifier:
mindat:1:1:47739:6

Similar NamesHide

UM1991-21-SiO:AlFeHMg(Fe,Al,Mg)6(Si,Al)4O10(OH)4 · H2O
UM1997-49-SiO:AlFeMgA synonym of JeffbeniteMg3Al2Si3O12
UM1998-//-BOSiO:AlFeMg[2](Fe2+,Mg)2Al14Si4B4O37
UM2002-52-SiO:AlFeMgMg4(Mg1.5Fe+20.3Fe+31.6Al8.5)O4[Si1.7Al10.3O36]
UM2011-20-SiO:AlFeMgNa0.06Ca0.02Mg0.71Fe0.20Al0.11Si0.94O3

Physical Properties of UM1983-18-SiO:AlFeHMgHide

Colour:
Pale yellow in thin section

Chemistry of UM1983-18-SiO:AlFeHMgHide

Mindat Formula:
~(Mg,Fe)Al4Si4O12(OH)8
Element Weights:
Element% weight
O55.881 %
Si19.619 %
Al18.848 %
Mg4.245 %
H1.408 %

Calculated from ideal end-member formula.
Elements listed:
Al, Fe, H, Mg, O, Si - search for minerals with similar chemistry

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for UM1983-18-SiO:AlFeHMgHide

References for UM1983-18-SiO:AlFeHMgHide

Localities for UM1983-18-SiO:AlFeHMgHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Malawi
 
  • Northern Region
    • Mzimba
Haslam (1983) +1 other reference
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