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Willhendersonite & Gismondine

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SKY187783

Willhendersonite & Gismondine

Rare Mineral

Description Tabs

Description
Locality: 
Eifel Mountains, Rhineland-Palatinate, Germany
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2 × 2 × 0.8 cm
Description

Colorless gemmy willhendersonite crystals, a rare mineral at Eifel, associated to off-white uncommon gismondite globular aggregates. Willhendersonite is a marker for other extremely rare species at Eifel. The mineral has been found in a few localities worldwide. Very nice under the microscope.

Mineral Data
What's on the rock

Willhendersonite

Formula: 
KCa[Al3Si3O12]·5H2O
Strunz: 
9.GD.10
Hardness: 
3.0
Streak: 
White
Type Locality: 
Vispi Quarry (incl. Celli; Pian di Celle), San Venanzo, Terni Province, Umbria, Italy

Gismondine

Synonym Of: 

Gismondine-Ca

Formula: 
CaAl2Si2O8·4H2O
Strunz: 
9.GC.05
Hardness: 
0.0
Group Parent: 
Zeolite Group

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