BH250-62
Title
BH250-62
Subject
Minnesotaite
Description
Major Mineral: Minnesotaite
Minor Minerals: quartz
BH250-62 is a minnesotaite-rich rock collected from the Hibbing Mine area in northern Minnesota, part of the world-renowned Mesabi Iron Range. This sample represents a fine-grained, silicate-rich assemblage derived from the Biwabik Iron Formation, a classic banded iron formation (BIF).
The dominant mineral, minnesotaite, is an iron-magnesium silicate with the chemical formula (Fe²⁺, Mg)₃Si₄O₁₀(OH)₂. It belongs to the pyrophyllite–talc group and serves as the iron-rich analogue of talc. Minnesotaite typically occurs as soft, platy, or fibrous aggregates with a greenish-gray to olive hue and a greasy luster.
Minor Minerals: quartz
BH250-62 is a minnesotaite-rich rock collected from the Hibbing Mine area in northern Minnesota, part of the world-renowned Mesabi Iron Range. This sample represents a fine-grained, silicate-rich assemblage derived from the Biwabik Iron Formation, a classic banded iron formation (BIF).
The dominant mineral, minnesotaite, is an iron-magnesium silicate with the chemical formula (Fe²⁺, Mg)₃Si₄O₁₀(OH)₂. It belongs to the pyrophyllite–talc group and serves as the iron-rich analogue of talc. Minnesotaite typically occurs as soft, platy, or fibrous aggregates with a greenish-gray to olive hue and a greasy luster.
Coverage
Location: mine in northern Minnesota, Minnesota, USA
GPS Coordinates: 47°27'31.68"N, 92°56'3.23"W
GPS Coordinates: 47°27'31.68"N, 92°56'3.23"W
Creator
Bereket Haileab
Source
From the rock collection of Bereket Haileab. Sample 62. Housed at Carleton College in Minnesota.
Type
Thin section
Relation
Collection
Citation
Bereket Haileab, “BH250-62,” BH250 Mineralogy Teaching Collection, accessed April 25, 2026, https://bereket-haileab.geology.sites.carleton.edu/items/show/72.