BH250-33b
Title
BH250-33b
Subject
Sodalite
Description
Major Mineral: sodalite
Optic Character: Isotropic (cubic system), blue under ppl, generally isotropic with low relief; may exhibit a faint bluish tint in plane-polarized light.
Sodalite is a relatively rare, blue-colored tectosilicate mineral of the feldspathoid group. It typically forms in silica-undersaturated, alkaline igneous rocks such as nephelinite, phonolite, and sodalite syenite. Sodalite commonly occurs in environments where quartz is absent or scarce and is frequently associated with nepheline, leucite, cancrinite, and feldspar.
This mineral sample was purchased from a collector in Rapid City, South Dakota. A large hand specimen is also available in the miscellaneous rock collection in Anderson 129.
Optic Character: Isotropic (cubic system), blue under ppl, generally isotropic with low relief; may exhibit a faint bluish tint in plane-polarized light.
Sodalite is a relatively rare, blue-colored tectosilicate mineral of the feldspathoid group. It typically forms in silica-undersaturated, alkaline igneous rocks such as nephelinite, phonolite, and sodalite syenite. Sodalite commonly occurs in environments where quartz is absent or scarce and is frequently associated with nepheline, leucite, cancrinite, and feldspar.
This mineral sample was purchased from a collector in Rapid City, South Dakota. A large hand specimen is also available in the miscellaneous rock collection in Anderson 129.
Creator
Bereket Haileab
Source
From the rock collection of Bereket Haileab. Sample BH250-33b. Housed at Carleton College in Minnesota.
Type
Thin section and hand sample
Relation
Collection
Citation
Bereket Haileab, “BH250-33b,” BH250 Mineralogy Teaching Collection, accessed April 24, 2026, https://bereket-haileab.geology.sites.carleton.edu/items/show/333.