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Ruifrancoite Meurigite-K & Cyrilovite

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SKY182947

Ruifrancoite Meurigite-K & Cyrilovite

Rare Mineral
Type Locality

Description Tabs

Description
Locality: 
Sapucaia Mine, Sapucaia do Norte, Galiléia, Minas Gerais, Brazil
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 1.5 × 1.3 cm
Description

Interesting combination of three rare minerals: ruifrancoite from type locality (brown globular aggregates, first and third photos)), meurigite-(K) (pale yellor hairy globular aggregates, fourth photo,) and cyrilovite (smaller deep yellow globules, fifth photo), all of them associated to tabular hexagonal muscovite crystals (second photo). Very nice under the microscope !

Mineral Data
What's on the rock

Ruifrancoite

Formula: 
Ca22(Fe3+,Mn2+,Mg)4Be4(PO4)6(OH)4(OH,H2O)2·4H2O
Strunz: 
8.DA.10
Hardness: 
4.5
Type Locality: 
Sapucaia Mine (Proberil mine), Sapucaia do Norte, Galiléia, Doce valley, Minas Gerais, Brazil

Meurigite-K

Formula: 
KFe3+8(PO4)6(OH)7·6.5H2O
Strunz: 
8.DJ.20
Crystal System: 
Monoclinic
Hardness: 
3.0
Streak: 
White
Type Locality: 
Chino Mine (Santa Rita Pit; Santa Rita Mine), Santa Rita, Santa Rita District, Grant Co., New Mexico, USA

Cyrilovite

Formula: 
NaFe3+3(PO4)2(OH)4·2H2O
Strunz: 
8.DL.10
Crystal System: 
Tetragonal
Hardness: 
4.0
Streak: 
Yellow
Type Locality: 
Cyrilov phosphate pegmatite (Cyrillhof), Velké Meziříčí, Vysočina Region, Moravia (Mähren; Maehren), Czech Republic

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