BH250-135
Title
BH250-135
Subject
kaersutite (Amphibole)
Description
Major minerals: kaersutite
Texture: prismatic crystals, two cleavages at 60/120 degrees
Optics: pleochroism, cleavage angles
Frank H. Brown mapped the Korath Range in southern Ethiopia in 1968. He and I returned to the area in 1986, during which these amphibole samples were collected. They were taken from a mafic clot formed during an eruption that produced an unusually large volume of amphiboles. The host lavas are classified as basanites and tephrites.
A detailed description of the geology of the Korath Range can be found in:
Brown, F.H., & Carmichael, I.S.E. (1969). Quaternary volcanoes of the Lake Rudolf (now Lake Turkana) region: 1. The basanite-tephrite series of the Korath Range. Lithos, 2, 239–260. https://doi.org/10.1016/S0024-4937(69)80018-6
Unfortunately, the photographs taken during that summer did not turn out well due to a malfunctioning camera, and I have not visited the outcrops of Korath since 1986. Nevertheless, for those interested, the Korath Range remains a geologically fascinating and worthwhile site to explore.
Texture: prismatic crystals, two cleavages at 60/120 degrees
Optics: pleochroism, cleavage angles
Frank H. Brown mapped the Korath Range in southern Ethiopia in 1968. He and I returned to the area in 1986, during which these amphibole samples were collected. They were taken from a mafic clot formed during an eruption that produced an unusually large volume of amphiboles. The host lavas are classified as basanites and tephrites.
A detailed description of the geology of the Korath Range can be found in:
Brown, F.H., & Carmichael, I.S.E. (1969). Quaternary volcanoes of the Lake Rudolf (now Lake Turkana) region: 1. The basanite-tephrite series of the Korath Range. Lithos, 2, 239–260. https://doi.org/10.1016/S0024-4937(69)80018-6
Unfortunately, the photographs taken during that summer did not turn out well due to a malfunctioning camera, and I have not visited the outcrops of Korath since 1986. Nevertheless, for those interested, the Korath Range remains a geologically fascinating and worthwhile site to explore.
Coverage
Location: Korath, Southern Ethiopia
GPS Coordinates: 5° 5'50.84"N, 35°53'8.07"E
GPS Coordinates: 5° 5'50.84"N, 35°53'8.07"E
Date
Collected summer 1986 as ETH-86-333
Creator
Bereket Haileab
Source
From the rock collection of Bereket Haileab. Sample BH250-135. Housed at Carleton College in Minnesota.
Contributor
Bereket Haileab
Type
Thin section and hand sample
Relation
View on ArcGIS Online here
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Collection
Citation
Bereket Haileab, “BH250-135,” BH250 Mineralogy Teaching Collection, accessed April 26, 2026, https://bereket-haileab.geology.sites.carleton.edu/items/show/187.