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Sérandite Ussingite & Steenstrupine-(Ce)

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POL829909

Sérandite Ussingite & Steenstrupine-(Ce)

Description Tabs

Description
Locality: 
Shkatulka Pegmatite, Umbozero Mine, Alluaiv Mountain, Lovozero Massif, Murmansk Oblast, Russian Federation
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.2 × 4.5 × 3.4 cm
Description

Very rich sample of orange prismatic Serandite crystals in lilac ussingite matrix with some black, glassy grains of rare Steenstrupine-(Ce) from the world's largest ussingite body.

Mineral Data
What's on the rock

Sérandite

Formula: 
Na(Mn2+,Ca)2(HSi3O9)
Strunz: 
9.DG.05
Hardness: 
5.0 - 5.5
Streak: 
White
Type Locality: 
Rouma Island (Roume Island; Roma Island; Ruma Island), Los Archipelago (Los Islands), Guinea

Ussingite

Formula: 
Na2AlSi3O8OH
Strunz: 
9.EH.20
Crystal System: 
Triclinic
Hardness: 
6.0 - 7.0
Streak: 
white
Type Locality: 
Kangerluarsuk Fjord (Kangerdluarssuq Fjord), Ilímaussaq complex, Narsaq, Kujalleq, Greenland

Steenstrupine-(Ce)

Formula: 
Na14Mn2+2(Fe3+,Mn3+)2Ce6(Zr,Th)(Si6O18)2(PO4)6(HPO4)(OH)2·2H2O
Strunz: 
9.CK.20
Hardness: 
4.0
Type Locality: 
Kangerluarsuk Fjord (Kangerdluarssuq Fjord), Ilímaussaq complex, Narsaq, Kujalleq, Greenland

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