Greenschist

Title

Greenschist

Alternative Title

Greenschist

Identifier

TMJ-12

Description

Rock Sample:
The sample color is light brown to dark brown in color with white residue through out the surface. The rock has a light green tint. There is a greasy luster to the sample. There are large white veins and planes of cleavage that follow a foliation pattern. The large white veins react with acid. There is a petal-like residue of white and brown minerals. The sample experienced chemical weathering. The rock has a silty texture.

Thin Section:
There are some small veins. The matrix is too small to identify with a microscope but it is dark in color while under PPL and a very light yellow color under XPL. Some of the plagioclase is curved. The matrix intergrown in many of the quartz crystals. The sample is holocrystalline.
-Quartz (75%)
-Unknown Matrix (~15-25%)
-Plagioclase (~7%)
-Magnification at 4x/0.10

Date

1969

Contributor

Western Minerals, Inc.

Spatial Coverage

Tanzawa Mountains, Japan (Zone IV)

Temporal Coverage

N/A

Accrual Method

Purchased from Western Minerals Inc.

Unit

Greenschist Facies Volcanic (Zone IV)

Number of Thin Sections

1

Geolocation