Title
Quartz Diorite
Alternative Title
Biotite - Plagioclase - Quartzite
Identifier
TMJ-04
Description
Rock Sample:
The sample has black to green phenocrysts with a greenish white matrix. It has phaneritic grains with a aphanetic matrix. Phenocrysts are coarse to fined grained ranging from 0.1~1cm in size. There is a chalk like powder on the outside of the sample (white). There are deep fractures running to the center of the sample. It is likely that the sample underwent chemical weathering by oxidation. The chemical weathering is evident due to the orange brown tint. Overall the sample has a smooth weathered outside with rough gritty inside.
Thin Section:
Minerals are either medium in size. All the minerals seem to have intergrown in the quartz crystals.
-Quartz (50%)
-Plagioclase (20%)
-Biotite (15%)
-Hornblende (15%)
-Magnification at 4x/0.10
The sample has black to green phenocrysts with a greenish white matrix. It has phaneritic grains with a aphanetic matrix. Phenocrysts are coarse to fined grained ranging from 0.1~1cm in size. There is a chalk like powder on the outside of the sample (white). There are deep fractures running to the center of the sample. It is likely that the sample underwent chemical weathering by oxidation. The chemical weathering is evident due to the orange brown tint. Overall the sample has a smooth weathered outside with rough gritty inside.
Thin Section:
Minerals are either medium in size. All the minerals seem to have intergrown in the quartz crystals.
-Quartz (50%)
-Plagioclase (20%)
-Biotite (15%)
-Hornblende (15%)
-Magnification at 4x/0.10
Date
1969
Contributor
Western Minerals, Inc.
Is Part Of
Spatial Coverage
Tanzawa Mountains, Japan South of North Contact
Temporal Coverage
N/A
Accrual Method
Purchased from Western Minerals Inc.
Unit
N/A
Number of Thin Sections
1