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Quadratite Smithite Jordanite & Rutile

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BIN152369

Quadratite Smithite Jordanite & Rutile

Description Tabs

Description
Locality: 
Lengenbach Quarry, Binntal, Valais, Switzerland
Size Range: 
Thumbnail (1-3cm)
Size: 
1.3 × 2.4 × 1.9 cm
Description

Quadratite (AgCdAsS3) is one of the famous rarities of Lengenbach Quarry. On this specimen a small vug hosts many small aggregates and small striated crystals of silvery jordanite (and a crystal of black rutile very deep in the vug and therefore not photographed).

In addition to these rather common species a small black tabular crystal of quadratite is present, surrounded by jordanite. Very remarkable is the epitactic intergrowth of the quadratite with red needles of smithite. The smithite crystals have the same directions as the edges of the quadratite crystal and for this reason have perpendicular orientation with each other.

The close-up image with the larger FOV is ~1.2 mm wide.

Found in 1997.

ref. Graeser et. al. "Faszination Lengenbach" (2008), p. 35-36

Mineral Data
What's on the rock

Quadratite

Formula: 
Ag(Cd,Pb)AsS3
Strunz: 
2.GC.25
Crystal System: 
Tetragonal
Hardness: 
3.0
Type Locality: 
Lengenbach Quarry, Fäld (Imfeld; Im Feld; Feld), Binn Valley, Wallis (Valais), Switzerland

Smithite

Formula: 
AgAsS2
Strunz: 
2.GC.30
Crystal System: 
Monoclinic Tabular crystals.
Hardness: 
1.5 - 2.0
Type Locality: 
Lengenbach Quarry, Fäld (Imfeld; Im Feld; Feld), Binn Valley, Wallis (Valais), Switzerland

Jordanite

Formula: 
Pb14(As,Sb)6S23
Strunz: 
2.JB.30a
Hardness: 
3.0
Streak: 
Black
Type Locality: 
Lengenbach Quarry, Fäld (Imfeld; Im Feld; Feld), Binn Valley, Wallis (Valais), Switzerland

Rutile

Formula: 
TiO2
Strunz: 
4.DB.05
Crystal System: 
Tetragonal - Ditetragonal Dipyramidal
Hardness: 
6.0 - 6.5
Type Locality: 
Rutile locality, Horcajuelo de la Sierra, Madrid, Spain
BinnMin

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