Greenstone / altered basalt fragment
Likely chlorite–epidote–actinolite altered basalt; exact identification requires testing
igneous
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
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Sandstone (Quartz Sandstone)
Arenite (primarily SiO2)
sedimentary
Banded Chert (River Stone)
Silicon Dioxide (SiO2)
sedimentary
Diamond
Carbon (C)
mineral
Tumbled honey-colored chalcedony or quartzite
Microcrystalline quartz, SiO₂; exact identification requires testing
mineral
Vesicular volcanic rock, likely weathered pumice or scoria
Pumice/scoria; predominantly volcanic glass and feldspar, with possible iron oxides
igneous
Sandstone (Ferruginous)
Arenite (with Hematite/Limonite cement)
sedimentary
Tumbled citrine or iron-stained quartz
Quartz (SiO₂), likely iron-oxide-stained or natural citrine
mineral
Painted Rock / Geode Specimen
Silicon Dioxide with artificial pigment coating
mineral
Sandstone (Quartzose type)
Arenite (primarily SiO2)
sedimentary
Diamond (Cluster Ring)
Carbon (C)
mineral
Vesicular Basalt / Scoria pebble
Extrusive igneous rock with amygdaloidal infilling
igneous
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Note: No specimen visible
N/A
Granite
Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).
igneous
Sandstone (Quartz Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Blue Goldstone
Synthetic glass with copper or cobalt/manganese inclusions
man-made glass
Sandstone
Arenite
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Sandstone (Ferruginous)
Sandstone (primarily SiO2 with iron oxide cement Fe2O3)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Sandstone (SiO2-rich detrital sedimentary rock)
sedimentary
Corundum (Sapphire variant)
Aluminium oxide (Al2O3)
mineral
Sandstone
Sedimentary Clastic Rock
sedimentary
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
Sandstone (with Iron concretions/staining)
Arenite (composed primarily of Quartz and Feldspar with Iron Oxide cement)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz - SiO2)
sedimentary
Diamond (Cut and Polished)
Diamond (pure Carbon, C)
gemstone
Red Sandstone Pebble
Sedimentary quartz sandstone
sedimentary
Glass / Silicon Dioxide (Man-made)
SiO2 (Amorphous Silicon Dioxide)
Amorphous Solid
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Diamond (in a jewelry setting)
Cubic Carbon (C)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Sandstone (clastic sedimentary rock, predominantly SiO2)
sedimentary
Ferro-silicate Slag
Industrial Vitrified Slag (High-silica amorphous glass)
Mineral byproduct (Anthropogenic)
Polished ocean jasper (orbicular jasper), probable
Microcrystalline quartz (SiO₂), chiefly chalcedony with iron-oxide and other mineral inclusions
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Diamond
Carbon (C)
gemstone
Natural Pearl
Calcium carbonate (primarily Aragonite and Conchiolin), CaCO3
mineral
Blue-green chrysocolla rough specimen
Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite
mineral
Tumbled quartz-rich pebble
Microcrystalline quartz (SiO₂), possibly weathered chert or chalcedony
mineral