Granite
Intrusive Felsic Igneous Rock (primarily Quartz and Feldspar)
igneous
Category
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Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Chert (varietal Flint)
Microcrystalline quartz (SiO2)
sedimentary
Coquina and Oyster Fossil Rock
Coquina limestone (Calcium Carbonate, CaCO3) containing fossilized Crassostrea / bivalve shells
fossil
Diamond (in jewelry setting)
Diamond (C - Carbon)
mineral
Chert (varietal Chalcedony or Flint)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Green Slag Glass
Cullet (Amorphous Silicon Dioxide with impurities)
Man-made rock-like material
Carved Stone Turtle
Carved Soapstone and Quartz
mineral
Diorite (River Pebble)
Intermediate plutonic igneous rock
igneous
Fossilized Coral (Petoskey Stone / Hexagonaria)
Hexagonaria percarinata / Rugosa coral (CaCO3)
fossil
Fossilized Bored Limestone
Limestone with Ichnofossils (Gastrochaenolites or Entobia)
sedimentary
Desert Rose (also known as Sand Rose)
Gypsum (CaSO4·2H2O) or Barite (BaSO4) with sand inclusions
mineral
Chert (River Siltstone/Quartzite type)
Microcrystalline Quartz (SiO2)
sedimentary
Crinoid Fossil Stem Segment
Class Crinoidea (Echinodermata)
sedimentary
Sandstone (likely Fossiliferous)
Arenite / Fossiliferous Sandstone (SiO2 composition)
sedimentary
Iron-stained quartz-rich rock, possibly jasper or chert
Microcrystalline quartz (SiO₂) with iron oxides/hydroxides
mineral
Chert (Jasper type)
Microcrystalline Quartz (SiO2)
sedimentary
Ferruginous Sandstone (Ironstone)
Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Anthracite Coal
Anthracite (a variety of coal, predominantly carbon)
Sedimentary Rock (Metamorphosed)
Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)
Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)
metamorphic
Amber
Succinite (Fossilized Tree Resin)
fossil
Amber (Copal)
Succinate (Fossilized Resin)
mineraloid
Chert Pebble
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Tumbled amber-colored chalcedony or jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
mineral
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Lapis Lazuli
Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Grey Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Amber
Amber (Fossilized Tree Resin)
mineral
Titanium Aura Quartz (Aura Quartz)
Titanium-coated Silicon Dioxide (SiO2)
mineral
Bituminous Coal (with Anthracite or Vitrinite inclusion)
Organic-rich Sedimentary Rock (Carboniferous classification)
sedimentary
Diorite
Intermediate plutonic igneous rock
igneous
White Marble
Recrystallized Calcite Rock (CaCO3)
metamorphic
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Slag
Ferrous Slag (Siliceous industrial waste)
Anthropogenic (Man-made industrial byproduct)
Dalmatian Stone
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Amber (Copal)
Organic gemstone, fossilized tree resin (often immature amber or copal)
Mineral
Note: Item is not a geological specimen
n/a
none
Lapis Lazuli
Complex mixture of minerals, primarily Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Quartz Variety)
Chert (Silicon Dioxide, SiO2)
sedimentary