BH250-29
Title
BH250-29
Subject
Chlorite Schist
Description
Major Minerals: chlorite, sulfides
Minor Minerals: oxide, magnetite
BH250-29 is a chlorite schist, a metamorphic rock characterized by a schistose texture dominated by fine- to medium-grained chlorite, giving the hand sample a greenish hue. Sulfide minerals indicate either metamorphism of a sulfur-bearing protolith or later hydrothermal overprinting. Magnetite occurs as an accessory oxide phase, visible under the microscope with the condenser lens inserted.
This rock likely formed from mafic igneous protoliths, such as basalt or gabbro, under Low-grade greenschist facies.
Chlorite has low birefringence, producing green to light green colors.
Minor Minerals: oxide, magnetite
BH250-29 is a chlorite schist, a metamorphic rock characterized by a schistose texture dominated by fine- to medium-grained chlorite, giving the hand sample a greenish hue. Sulfide minerals indicate either metamorphism of a sulfur-bearing protolith or later hydrothermal overprinting. Magnetite occurs as an accessory oxide phase, visible under the microscope with the condenser lens inserted.
This rock likely formed from mafic igneous protoliths, such as basalt or gabbro, under Low-grade greenschist facies.
Chlorite has low birefringence, producing green to light green colors.
Creator
Bereket Haileab
Source
From the rock collection of Bereket Haileab. Sample BH250-29. Housed at Carleton College in Minnesota.
Type
Thin section
Relation
Collection
Citation
Bereket Haileab, “BH250-29,” BH250 Mineralogy Teaching Collection, accessed April 26, 2026, https://bereket-haileab.geology.sites.carleton.edu/items/show/32.