Title
Basaltic Tuff Breccia of Actinolite Greenschist
Alternative Title
Chlorite - Muscoivite - Greenschist
Identifier
TMJ-14
Description
Rock Sample:
The sample is brown to white to green in color. It is porphyritic and has foliations that fan out. There are also wide fractures (≤1mm in length). There is a brownish orange coating which is evidence of chemical weathering. There are some holes around the oxidation zones which suggest deep weathering by a liquid. The sample does not react with acid. It has a silty yet jagged texture.
Thin Section:
There are micro-fractures that are non-uniform. The sample is holocrystalline. The majority of the matrix intergrows within many of the larger crystals. The rest of the thin section has a matrix that cannot be identified from a standard microscope.
-Chlorite (30%)
-Muscovite (10%)
-Serpentine (5%)
-Epidote (5%)
-Magnification at 4x/0.10
The sample is brown to white to green in color. It is porphyritic and has foliations that fan out. There are also wide fractures (≤1mm in length). There is a brownish orange coating which is evidence of chemical weathering. There are some holes around the oxidation zones which suggest deep weathering by a liquid. The sample does not react with acid. It has a silty yet jagged texture.
Thin Section:
There are micro-fractures that are non-uniform. The sample is holocrystalline. The majority of the matrix intergrows within many of the larger crystals. The rest of the thin section has a matrix that cannot be identified from a standard microscope.
-Chlorite (30%)
-Muscovite (10%)
-Serpentine (5%)
-Epidote (5%)
-Magnification at 4x/0.10
Date
1969
Contributor
Western Minerals, Inc.
Is Part Of
Spatial Coverage
Tanzawa Mountains, Japan Southern edge of (Zone IV)
Temporal Coverage
N/A
Accrual Method
Purchased from Western Minerals Inc.
Unit
Greenschist Facies (Zone IV)
Number of Thin Sections
1