Tumbled brown chalcedony (likely jasper or agate)
Microcrystalline quartz, SiO₂; chalcedony with iron-oxide staining
mineral
Category
Anthropogenic (Man Made Material)
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Diamond
Carbon (C)
mineral
Rutilated Quartz
Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions
mineral
Granodiorite
Intrusive Igneous Rock
igneous
Diamond
Diamond (pure carbon C)
mineral
Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite
mineral
Quartz (Engineered Quartz Surface)
Silicon Dioxide (SiO2) based composite
mineral (man-made composite)
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartz Pebble (Beach Chalcedony)
Silicon Dioxide (SiO2)
mineral
Chalk
Micrite (primarily Calcium Carbonate or CaCO3)
sedimentary
Diabase (Greenstone)
Diabase (also known as Dolerite)
igneous
Chert / Flint
Chert (varieties include Flint)
Sedimentary
Sea Glass
Amorphous silicon dioxide (glass)
mineral
Chert
Chert (Microcrystalline Quartz)
sedimentary
Basalt
Basalt
igneous
Quartzite pebble
Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Sandstone
metamorphic
Sea Glass
Amorphous Silica (Glass) SiO2
Mineraloid (Man-made origin)
Blue Goldstone
Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)
Synthetic (Man-made Glass)
Blue Slag Glass
Ferro-silicate glass (Slag)
igneous (man-made/industrial)
Cullet Glass (Strawberry Glass)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Mineraloid (Synthetic/Man-made)
Granite
Intrusive Igneous Rock (Granitic)
igneous
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Granite
Granite (Phaneritic Quartz-Feldspar intrusive rock)
Igneous
Quartzite
Metamorphic Quartzite
metamorphic
Green Quartzite
Metamorphic Quartz Sandstone (SiO2)
metamorphic
Red Quartzite
Quartzite (Metamorphosed Quartz Arenite)
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Natural Pearl
Calcium carbonate (primarily Aragonite and Conchiolin), CaCO3
mineral
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic