BH250-116
Title
BH250-116
Subject
Rhyolite
Description
BH250-116 – Rhyolite from Lighthouse Point, North Shore Area
This specimen is a rhyolite collected from Lighthouse Point along Minnesota’s North Shore. The rock preserves vesicular textures formed by trapped volcanic gases during solidification. These vesicles are now filled with secondary minerals, likely including quartz, calcite, or zeolites, deposited from hydrothermal fluids or low-temperature alteration after emplacement. The fine-grained groundmass and silica-rich composition reflect its origin from high-viscosity felsic lava, characteristic of explosive volcanic environments.
This specimen is a rhyolite collected from Lighthouse Point along Minnesota’s North Shore. The rock preserves vesicular textures formed by trapped volcanic gases during solidification. These vesicles are now filled with secondary minerals, likely including quartz, calcite, or zeolites, deposited from hydrothermal fluids or low-temperature alteration after emplacement. The fine-grained groundmass and silica-rich composition reflect its origin from high-viscosity felsic lava, characteristic of explosive volcanic environments.
Coverage
Location: Northern Minnesota, Minnesota, USA
Found near Split Rock Lighthouse
Found near Split Rock Lighthouse
Creator
Bereket Haileab
Source
From the rock collection of Bereket Haileab. Sample 116. Housed at Carleton College in Minnesota.
Type
Thin section
Relation
Collection
Citation
Bereket Haileab, “BH250-116,” BH250 Mineralogy Teaching Collection, accessed April 25, 2026, https://bereket-haileab.geology.sites.carleton.edu/items/show/137.