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Graphic Granite Amazonite

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PDM1001606

Graphic Granite Amazonite

Description Tabs

Description
Locality: 
Høydalen, Tørdal, Drangedal, Vestfold og Telemark, Norway
Class: 
Crystal Group/Cluster
Size Range: 
Cabinet (10-18 cm)
Size: 
12.9 × 7.3 × 1.2 cm
Weight: 
170.00gr
Description

Tick slab of a big blueish microcline (var. amazonite) crystal from Norway that includes the characteristic distribution of distinctive grey quartz inside, of repetitive cuneiform pattern, that form the so called graphic texture. No damages, cut at both sides, unpolished. The graphic texture is commonly created by exsolution and devitrification and immiscibility processes in igneous rocks. It is called 'graphic' because the exsolved or devitrified minerals form lines and shapes which are reminiscent of writing (Fenn, 1986).

Acquired in Zwolle 1984 from Jan Sibtsen, who collected and cut this specimen. Ex Wilfred Moorer (1945-2015) #3269.

Combine specimens to reduce shipping costs!.

 

Fenn, P.M., (1986). On the origin of graphic granite. American Mineralogist, 71, 325-330 pp.

Free available online.

Mineral Data
What's on the rock

Graphic Granite

Mixture Of: 

Feldspar Group

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Hardness: 
7.0

Amazonite

Variety Of: 

Microcline

Formula: 
KAlSi3O8
Strunz: 
9.FA.30
Hardness: 
6.0 - 6.5
Hardness: 
0.0

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