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Fluorapatite & Hornblende

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RSL562331

Fluorapatite & Hornblende

Description Tabs

Description
Locality: 
Imilchil, Errachidia Province, Drâa-Tafilalet Region, Morocco
Class: 
Crystal Group/Cluster
Size Range: 
Small cabinet (7-10 cm)
Size: 
7 × 3 × 3 cm
Description

Group of sharp fluorapatite crystals of good size showing parallel growth, an elongated prism with vertical striations, and multiple terminal faces truncated by the pinacoid. Good brilliance, translucent and a very distinctive greenish yellow color. They present numerous inclusions of flattened prismatic deep black crystals, also vertically striated and opaque. SEM-EDS analyses indicate that they probably belongs to the hornblende group, most likely magnesio-ferri-hornblende. We will send analysis to the buyer. A very aesthetic and aerial shape specimen.

Mineral Data
What's on the rock

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

Hornblende

Synonym Of: 

Ferro-hornblende

Formula: 
☐{Ca2}{Fe2+4Al}(AlSi7O22)(OH)2
Strunz: 
9.DE.10
Hardness: 
5.0 - 6.0

Magnesio-hornblende

Formula: 
☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
Strunz: 
9.DE.10
Hardness: 
5.0 - 6.0