General Information:
Chemical Formula:(Mn++1-xFe+++x)Al(PO4)(OH)2-xOx
Composition:(Molecular Weight = 210.86 gm)Manganese 13.03 %
MnAluminum 12.80 %
AlIron 13.24 %
FePhosphorus 14.69 %
P Hydrogen 0.72 %
H Oxygen 45.53 %
O Empirical Formula: Mn2+0.5Fe3+0.5Al(PO4)(OH)1.5O0.5
Environment:Oxidation product of eosphoite in granitic pegmatite.
IMA Status:Approved IMA 1970
Locality:Daib-East farm, Karibib, Namibia.
Name Origin:Named for Theodor K. A. Ernst (1904-), mineralogist, University of Erlangen, Germany.
Physical Properties: Cleavage:[010] Good, [100] Good
Color:yellow brown.
Density:3.07
Diaphaniety:Translucent
Habits:Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Aggregates - Made of numerous individual crystals or clusters.,
Hardness:3-3.5 - Calcite-Copper Penny
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