Moving mountains for you
Switch currency

Current Live Auctions

Current Live Fixed Price Sales

Gmelinite On Analcime

Views:
Watches:
PCZ158914

Gmelinite On Analcime

Type Locality

Description Tabs

Description
Locality: 
Little Deerpark Quarry, Glenarm, County Antrim, Northern Ireland, United Kingdom
Size Range: 
Cabinet (10-18 cm)
Size: 
12.5 × 9 × 8 cm
Description

I have been collecting at the type locality for Gmelinite for more than 20 yrs and, although I have found many nice specimens, never exposed any of the special specimens that I knew to exist there (i.e. like a couple Harry Foy showed me). Recently my luck changed and as a result I will, over the next few weeks, be offering some of these along with a couple from my own collection that have been ousted by superior specimens from my new find. This specimen comprises of well formed single crystals and aggregates of very good colour and sharpness on a bed of analcime crystals, some of which are the rare black variety. individual crystals are up to 0.9 cm across. One of the best specimens from the new find. Please note that unfortunately the black analcime usually fades quite quickly in light. This specimen has been saw trimmed on the back and base to reduce the matrix for aesthetic purposes, the trimming is not visible in display. (mass 760 gms)

Mineral Data
What's on the rock

Gmelinite

Synonym Of: 

Gmelinite-Ca

Formula: 
(Ca,Na2)[Al2Si4O12]·6H2O
Strunz: 
9.GD.05
Hardness: 
4.5

Gmelinite-K

Formula: 
(K2,Na2,Ca)[Al2Si4O12]·6H2O
Strunz: 
9.GD.05
Hardness: 
4.5

Gmelinite-Na

Formula: 
(Na2,Ca)[Al2Si4O12]·6H2O
Strunz: 
9.GD.05
Hardness: 
4.5
Group Parent: 
Zeolite Group

Analcime

Formula: 
Na2(Al2Si4O12)·2H2O
Strunz: 
9.GB.05
Crystal System: 
Triclinic
Hardness: 
5.0 - 5.5
Streak: 
White
Type Locality: 
Cyclopean Islands, Acitrezza (Aci Trezza), Etna Volcanic Complex, Catania Province, Sicily, Italy
Peter Crozier Minerals