Snowflake Obsidian (Flower Jasper variant)
Vitreous volcanic silicate with cristobalite inclusions
igneous
Category
Mineraloid (Impact Glass)
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Blue Topaz
Al2SiO4(F,OH)2 (Aluminum silicate fluoride hydroxide)
gemstone
Obsidian
Obsidian (principally SiO2 with MgO and Fe3O4)
igneous
Rounded gray stone, likely quartz-rich granitic rock
Probable granite or granitic gneiss; mainly quartz, feldspar, and mica
igneous
Heliodor (Yellow Beryl) / Greenish-Yellow Beryl
Beryl (Be3Al2Si6O18)
mineral
Granite or granitic gneiss
Felsic granitoid, chiefly quartz, feldspar, and mica; possibly weakly foliated gneiss
igneous
Iron Slag
Ferrous Slag (Industrial Byproduct)
mineraloid (anthropogenic byproduct)