Quartzite Cobble
Quartzite (principally SiO2)
metamorphic
Category
Non Geological
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Anthracite Coal
Anthracite (Carbon)
sedimentary
Obsidian with Slate/Tuff
Volcanic glass (SiO2) with associated pyroclastic rock
igneous
Obsidian
Volcanic glass
igneous
Goldstone (Brown/Gold variety)
Aventurine Glass (SiO2 with Copper inclusions)
Synthetic/Man-made glass (often mistaken for a mineral)
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions (SiO2 + Fe2O3)
igneous
Mahogany Obsidian
Volcanic glass containing Magnetite/Hematite
igneous
Obsidian
Obsidian (Amorphous volcanic glass)
igneous
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Anthracite Coal
Anthracite
metamorphic
Eclogite
Eclogite (Pyrope garnet and Omphacite pyroxene)
metamorphic
Anthracite Coal
Anthracite
metamorphic
River Cobble (Quartzite)
Quartzite (SiO2)
metamorphic
Amber
Succinite (with a generalized formula of C10H16O)
mineral
Siltstone
Siltstone (fined-grained clastic sedimentary rock)
sedimentary
Tektite (Indochinite)
Tektite - High-silica amorphous glass (SiO2 + Al2O3)
mineraloid
Amber
Succinite (approximate formula C10H16O)
mineral
Obsidian
Volcanic glass
igneous
Pink Opal
Hydrated Silica (SiO2·nH2O)
mineral
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Anthracite Coal
Anthracite
metamorphic
Tektite (Indochinite)
Tektite (SiO2 + Al2O3, Glassy Melts)
igneous
Note: Item is not a geological specimen
n/a
none
Not a geological specimen
N/A (man-made object)
N/A
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Anthracite Coal
Anthracite (Highly Metamorphosed Coal)
sedimentary
Quartzite with inclusions
Quartzite (SiO2)
metamorphic
Quartzite Cobble
Quartzite (SiO2 based metamorphic rock)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Conglomerate
Conglomerate (Clastic Sedimentary Rock)
sedimentary
Quartzite pebble
Quartzite (SiO2)
metamorphic
Green Quartzite
Quartzite (SiO2 with inclusions)
metamorphic
Quartzite Pebble
Metamorphic Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Orange Quartzite (River Pebble)
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Obsidian
Obsidian (Amorphous Volcanic Glass, SiO2)
igneous
Amber
Succinite (fossilized resin)
mineral
Yellow Ochre / Limonite
Limonite (FeO(OH)·nH2O)
Mineral
Red Quartzite
Quartzite (primarily SiO2)
metamorphic
White Opal
Hydrated Silica (SiO2·nH2O)
mineral