Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Category
None
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Quartzite
Quartzite (primarily SiO2)
metamorphic
Greenstone (Celadonite-bearing Volcanic)
Hydrothermally altered basalt or andesite with Celadonite (K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2)
metamorphic
Basalt Pebble
Mafic Igneous Rock (Basalt/Diabase)
igneous
Chert (Quartz var.)
Silicon Dioxide (SiO2)
sedimentary
Tumbled brown stone, likely jasper or fine-grained quartzite
Uncertain; probable microcrystalline quartz (SiO₂), possibly ferruginous jasper
sedimentary or metamorphic
Citrine (likely Heat-Treated)
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Agate
SiO2
mineral
Pink Opal
Hydrated Silica (SiO2·nH2O) with Palygorskite inclusions
Mineraloid
Rough Ruby
Corundum (Al2O3) with Chromium traces
mineral
Blue Opal in Matrix
Hydrated Silica (SiO2·nH2O)
mineral
Tumbled amber
Amber (fossilized plant resin), commonly succinite; organic mineraloid
gemstone
Man-made Metal Pin (Non-geological)
Antimony-Lead Alloy or Zinc/Brass Base with Electroplating
Metal Alloy / Manufactured Artifact
Ruby (Raw Corundum)
Corundum (Al2O3 with Chromium impurities)
mineral
Banded Flint (Polished Stripe Flint)
Silicon Dioxide (SiO2) - variety of Chert
sedimentary
Pink Quartzite
Quartzite (SiO2)
metamorphic
Quartzite (River Stone)
Quartzite (SiO2)
metamorphic
Black Obsidian
Volcanic Glass (70–75% SiO2 plus MgO, Fe3O4)
igneous
Goldstone
Avventurina (Cu + SiO2 glass)
mineral
Synthetic Costume Glove (Paws)
Polyethylene terephthalate (Polyester) & Polyurethane blend
Non-geological / Man-made textile
Indian Agate
Cryptocrystalline Quartz (SiO2)
mineral
Quartz-rich pegmatite (weathered feldspar–quartz rock)
Granitic pegmatite; primarily quartz (SiO₂), feldspar, and minor biotite/iron-oxide minerals
igneous
Cultured Marble (Synthetic)
Polymer-matrix composite (typically calcium carbonate in polyester resin)
Synthetic / Composite Material
Carnelian Agate
Silicon Dioxide (SiO2) - Chalcedony containing Iron Oxide impurities
mineral
Ammonite Fossil
Ammonoidea (Calcium carbonate or Pyrite replacement)
sedimentary
Rose Quartz
Quartz (Silicon dioxide, SiO2)
mineral
Chert
Silicon dioxide (SiO2)
sedimentary
Chert (often called Flint in archaeological contexts)
Microcrystalline or cryptocrystalline Silica (SiO2)
sedimentary
Chert Nodules in Sedimentary Rock
Microcrystalline Quartz (SiO2) within Clastic Matrix
sedimentary
Fossiliferous Chert
Silicon Dioxide (SiO2) with fossil inclusions
sedimentary
Sandstone
Arenite (SiO2 based typically)
sedimentary
Blue Dyed Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Chert (Jasper) Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint Gravel)
Silicon Dioxide (SiO2)
sedimentary
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Chert with Quartz Veins
Microcrystalline silica (SiO2)
sedimentary
Blue Quartzite (Dyed Quartzite)
Silicon Dioxide (SiO2) with dye
metamorphic
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Gold
Native Gold (Au)
mineral
Clear Quartz (Rock Crystal) Bracelet
Silicon Dioxide (SiO2)
gemstone
Chert with Fossil inclusions
Microcrystalline Quartz (SiO2) with biogenic inclusions
sedimentary