Amber (specifically Burmese Amber or Burmite)
Succiniferous fossil resin (C10H16O)
mineraloid
Category
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Citrine
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Synthetic Resin Charm (Seal Shape)
Polymer Resin with plastic glitter / Polyethylene terephthalate glitters
Synthetic material (Not a rock or mineral)
Ironstone Concretion / Limonite Node
Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O) with Goethite/Hematite
sedimentary
Tektite (Indochinite)
Tektite (Silica-rich natural glass)
mineral
Chert River Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead/Projectile Point)
Microcrystalline quartz (SiO2)
sedimentary
Possible iron meteorite fragment
Iron–nickel meteorite, likely kamacite–taenite alloy
meteorite
Amber (possibly copal)
Fossilized plant resin; amber is organic resin, commonly dominated by polymerized terpenoids
gemstone
Sandstone Flagstone
Quartz Arenite Sandstone
sedimentary
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint Nodules in Sandstone
Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock
sedimentary
Agate
Silicon Dioxide (SiO2)
mineral
Weathered quartz-rich rock, possibly iron-stained quartzite or quartz vein fragment
Mostly quartz (SiO₂), with probable iron-oxide staining and minor feldspar or clay minerals
metamorphic
Chert (and/or Siltstone River Pebble)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (specifically Chalcedony or Flint variation)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Rhyolite (Wonderstone)
Rhyolite (High-silica volcanic rock)
igneous
Chert (specifically Flint or Common Chert)
Silicon Dioxide (SiO2)
sedimentary
Obsidian / Chert (Arrowhead Artifact)
Obsidian (volcanic glass, SiO2 with impurities)
igneous
Aqua Aura Quartz
Silicon Dioxide (SiO2) bonded with Gold (Au)
mineral (treated)
Garnet (Rough Almandine Crystal)
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Gold Nugget
Native Gold (Au)
mineral
Shungite
Shungite (Non-crystalline carbon, C)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
igneous
Obsidian
Obsidian (Volcanic glass), SiO2 (70% or more)
igneous
Amygdaloidal Basalt with Agate/Chalcedony Infills
Amygdaloidal Basalt (Composition: SiO2 and (Mg,Fe)2SiO4 in matrix; SiO2 in amygdule)
igneous
Fancy Jasper
Silicon Dioxide (SiO2) with impurities
mineral
River Stone (Chert/Basalt mix)
Microcrystalline Quartz (Chert) / Basalt
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Rose Quartz in Matrix
Silicon Dioxide (SiO2) with traces of Titanium, Iron, or Manganese
mineral
Chert (Flint) Nodule
Cryptocrystalline Quartz (SiO2)
sedimentary
Black Jasper (Black Onyx substitute)
Silicon Dioxide (SiO2) with carbonaceous impurities
sedimentary (microcrystalline quartz)
One Pound Coin (UK)
Nickel-Brass Alloy (Cu-Zn-Ni)
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Limonite (with goethite)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace Titanium, Iron, or Manganese
mineral
Yellow Ochre / Limonite
Limonite (Hydrated Iron(III) Oxide-Hydroxide, FeO(OH)·nH2O)
mineral
Garnet (Almandine variety)
Almandine, Fe3Al2(SiO4)3
Mineral
Synthetic Resin (Artificial Specimen)
Polyurethane or Polyester Resin
mineraloid (man-made)
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agatized Coral / Rough Chalcedony Node)
Silicon Dioxide (SiO2)
mineral