BH250-94
Title
BH250-94
Subject
Stillwater Complex Granite
Description
Major Minerals: plagioclase, olivine
Minor Minerals: serpentine, oxides
Optical Properties: Pyroxene crystals are predominantly euhedral, showing well-defined crystal faces, while plagioclase feldspars appear anhedral, indicating they crystallized in a more spatially constrained environment.
Texture & Petrologic Significance: The mineral assemblage and textures are well-suited for estimating the bulk composition of the parent magma. This sample is ideal for phase diagram modeling exercises, particularly in studies of mafic igneous systems where equilibrium crystallization relationships are explored.
Minor Minerals: serpentine, oxides
Optical Properties: Pyroxene crystals are predominantly euhedral, showing well-defined crystal faces, while plagioclase feldspars appear anhedral, indicating they crystallized in a more spatially constrained environment.
Texture & Petrologic Significance: The mineral assemblage and textures are well-suited for estimating the bulk composition of the parent magma. This sample is ideal for phase diagram modeling exercises, particularly in studies of mafic igneous systems where equilibrium crystallization relationships are explored.
Coverage
Location: Stillwater, Montana, USA
Creator
Bereket Haileab
Source
From the rock collection of Bereket Haileab. Sample BH250-94. Housed at Carleton College in Minnesota.
Type
Thin section and hand sample
Relation
Collection
Citation
Bereket Haileab, “BH250-94,” BH250 Mineralogy Teaching Collection, accessed April 26, 2026, https://bereket-haileab.geology.sites.carleton.edu/items/show/107.