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Magnesioferrite: MgFe+++2O4 Diopside: CaMgSi2O6
Comments: Very dark brown Magnesioferrite Pleonaste (Iron-Magnesium spinel) with cream colored Calcite and gray green diopside.
Location: Aldan, Gon River, Russia.
Scale: 6 x 4.5 cm.
© Fabre Minerals
Magnesioferrite: MgFe+++2O4 Bromellite: BeO
Comments: A micro, water color, hexagonal or barrel shaped crystal of white bromellite to about 0.3 mm on yellowish calcite with associated black magnesioferrite.
Location: Langban, Varmland, Sweden.
© Tom Loomis / Dakota Matrix