Title
Tholeiitic Gabbro
Alternative Title
Gabbro
Identifier
KBR-1
Description
Samples KBR-1, KBR-2, and KBR-2A are from a vertical mass of gabbro showing progressive differentiation inward. This sample is medium grained and holocrystalline with a hypidiomorphic-granular texture. There are gray and black crystals, both ranging from <1mm- 3mm. There is a red rusty looking weathered surface. This rock has an average specific gravity.
Thin section images are shown in plain and cross polarized light at40x magnification.
The gabbro is composed of 65% plagioclase, 30% pyroxene, 3% oIivine, and 2% opaques.
Thin section images are shown in plain and cross polarized light at40x magnification.
The gabbro is composed of 65% plagioclase, 30% pyroxene, 3% oIivine, and 2% opaques.
Date
No date given.
Contributor
Western Minerals, Inc
Is Part Of
http://www.geosciencecollections.milne-library.org/collections/show/17
Spatial Coverage
Karoo- Birds River, Eastern Cape, South Africa
Temporal Coverage
183-179 Ma (Jurassic)
Accrual Method
Purchased from Western Minerals Inc
Unit
Lesotho Formation
Number of Thin Sections
1