BH250-28
Title
BH250-28
Subject
Epidote Skarn
Description
Major Minerals: epidote, calcite, chlorite
Optics: good grains to obtain optic axis figures
BH250-28 is a skarn dominated by epidote, calcite, and chlorite. Epidote occurs as granular to prismatic crystals, often displaying a pistachio-green color in hand sample.
Epidote grains in this sample are well-suited for obtaining optic axis figures, making it valuable for optical mineralogy study. Epidote shows high relief, strong pleochroism (yellow-green to green), and high birefringence.
Epidote-rich skarns commonly form when hydrothermal fluids from a cooling intrusion react with impure limestones or dolostones, producing calcium–aluminum silicate minerals. This sample likely represents a calcic skarn formed under medium- to low-pressure contact metamorphic conditions.
Optics: good grains to obtain optic axis figures
BH250-28 is a skarn dominated by epidote, calcite, and chlorite. Epidote occurs as granular to prismatic crystals, often displaying a pistachio-green color in hand sample.
Epidote grains in this sample are well-suited for obtaining optic axis figures, making it valuable for optical mineralogy study. Epidote shows high relief, strong pleochroism (yellow-green to green), and high birefringence.
Epidote-rich skarns commonly form when hydrothermal fluids from a cooling intrusion react with impure limestones or dolostones, producing calcium–aluminum silicate minerals. This sample likely represents a calcic skarn formed under medium- to low-pressure contact metamorphic conditions.
Creator
Bereket Haileab
Source
From the rock collection of Bereket Haileab. Sample BH250-28. Housed at Carleton College in Minnesota.
Contributor
Bereket Haileab
Type
Thin section
Relation
Collection
Citation
Bereket Haileab, “BH250-28,” BH250 Mineralogy Teaching Collection, accessed April 25, 2026, https://bereket-haileab.geology.sites.carleton.edu/items/show/31.