"Ward's Phenomena Lab Activities"

Coarse grained and abundant in plagioclase feldspar.

Unusual glassy tubes of fused sand produced by lightning strikes in desert sediments. Average size: 1.5"- 2".

Shiny black volcanic glass showing conchoidal fracture and some spherulites.

Shows porphyritic texture in a fine dark matrix abundant large feldspar phenocrysts. Hand specimen.

Gray, fine-grained, massive contact rock.

Gray to brown mudstone with abundant silt.

White, very dark green, and very dark red to light red granoblastic intergrowth of wollastonite, diopside, and andradite.

When minerals, rocks, and fossils cannot be accurately identified by macroscopic observation and testing, thin section slides can reveal the composition and structure of the specimens on a microscopic level.

Coarse-grained plagioclase and pyroxene with some olivine.

Classic, very coarse-grained igneous texture.