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Siderite Fluorapatite Limonite & Rubellite

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FFM828816

Siderite Fluorapatite Limonite & Rubellite

Classic Locality

Description Tabs

Description
Locality: 
Stak Nala, Gilgit-Baltistan, Pakistan
Class: 
Combination
Size Range: 
Cabinet (10-18 cm)
Size: 
11.6 × 9.3 × 4.5 cm
Largest Crystal: 
2.00cm
Description

Incredibly Complex Stak Nala Pegmatite example of Primary Siderite, Fluorapatite, Rubellite and Limonite. On one corner, the Siderite is either coated by or being replaced by Iridescent Pyrite or Chalcopyrite.  The specimen is littered with Fluorapatite barrels, the largest is 1.0 cm and they all have nice, etched faces.  The complex dark brown Siderite crystals are twinned and up to 2 cm.  Some of the Siderite is being replaced by Limonite.  The Rubellite needles occur in the corner opposite the Iridescent Siderite crystals as needles up to .7 cm in length.  This is a unique alpine specimen with a lot going on.

Mineral Data
What's on the rock

Siderite

Formula: 
FeCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.5
Streak: 
White

Fluorapatite

Formula: 
Ca2Ca3(PO4)3F
Strunz: 
8.BN.05
Crystal System: 
Hexagonal
Hardness: 
5.0
Streak: 
White
Type Locality: 
Sauberg Mine, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany

Rubellite

Variety Of: 

Tourmaline

Formula: 
A(D3)G6(T6O18)(BO3)3X3Z
Hardness: 
7
Hardness: 
0.0

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