Macfallite  Johnsenite-(Ce) Braunite-I  Image

Macfallite Johnsenite-(Ce) Braunite-I Image

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The Mineral News newsletter has expanded to sixteen (16) pages a month and it has added significant features such as frequent book reviews, photographs to supplement new mineral descriptions. Occasional color issues are produced as well.
Dakota Matrix was founded in 1996 and has offered systematic and rare mineral specimens online since 1998.
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 Braunite-I, Macfallite, Johnsenite-(Ce)

Large Braunite-I Image

Mineral: Braunite-I: Mn++Mn+++6SiO12  
Macfallite: Ca2(Mn+++,Al)3(SiO4)(Si2O7)(OH)3  
Johnsenite-(Ce): Na12(Ce,REE,Sr)3Ca6Mn3Zr3W(Si25O73)(CO3)(OH,Cl)2
Comments: Tiny - less than 1mm - maroon crystals of mcfallite suspended as inclusions in massive quartz along with larger spots of brown johnsenite-(Ce) and braunite.
Location: Artur mine, Jaguaracu, Minas Gerais, Brazil.
Scale: Overall 3 x 2.5 slab.
Copyright: © Tom Loomis / Dakota Matrix
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