Amphibolite

Title

Amphibolite

Alternative Title

Amphibolite

Identifier

TMJ-09

Description

Rock Sample:
The sample is very dark grey with light grey foliations.
The sample displays thin layering, some areas of chemical weathering, and microfoliations. It is aphanitic. There is quartz- like residue on the outside of the sample. It has a smooth feel throughout.
-Hardness = 5-6
-Streak = dark grey

Thin Section:
You can see very fine crystals within the thin section under the microscope. There is also a irregularly-shaped fracture within a quartz crystal. The sample is hypocrystalline, fine to medium sized glass crystals that flow with the rest of the minerals. A lot of the quartz is intergrown within augite crystals.
-Quartz (75%)
-Augite (20%)
-Plagioclase (5%)
-Magnification at 4x/0.10

Date

1969

Contributor

Western Minerals, Inc.

Spatial Coverage

Tanzawa Mountains, Japan Creek bed 0.3 Km of south contact of Quartz Diortite (Zone V)

Temporal Coverage

N/A

Accrual Method

Purchased from Western Minerals Inc.

Unit

(Zone V)

Number of Thin Sections

1

Geolocation