Synthetic Material (Not A Rock Or Mineral)

Granite

Granite; primarily quartz (SiO₂), feldspar, and mica

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)

Slate

Slate (Low-grade regional metamorphic rock)

Diorite

Intermediate Phaneritic Plutonic Rock - Diorite

Quartz-Mica Schist (with Muscovite)

Metamorphic Rock (Quartz, Muscovite, Feldspar)

Sandstone (with Iron Staining)

Clastic sedimentary rock (High Silica / Iron Oxide)

Granite boulder

Granite, composed mainly of quartz, alkali feldspar, plagioclase, and minor mica/amphibole

Limestone

Calcite rock (CaCO3)

Sandstone

Arenite (a specific type of sandstone with less than 15% matrix)

Diamond (appearing as a jewelry centerpiece)

Diamond (Formula: C)

Chert (within Limestone)

Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) matrix

Painted Pet Rock (Quartzite/Sandstone base)

Silicon Dioxide (SiO2) with anthropomorphic acrylic embellishments

Turquoise in Matrix

Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O

Fossil Coral

Rugosa or Tabulata coral fossil (Calcite/Silica replacement)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Granite Cobble

Granite (Phaneritic igneous rock)

Chert Nodules in Limestone

Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)

Carnelian

Chalcedony (cryptocrystalline quartz), SiO2

Dark volcanic sand / basaltic sand

Basalt-derived lithic sand, chiefly plagioclase, pyroxene, and volcanic glass

Rounded quartz-rich pebble

Chert or quartzite pebble (tentative; mostly microcrystalline quartz, SiO₂)

Quartzite

Quartzite (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Milky quartz (quartz-rich rock fragment)

Quartz, silicon dioxide (SiO₂)

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Coral Fossil (Petrified Coral)

Scleractinia (Order) - Calcified Fossil Skeleton (CaCO3)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

Porphyritic basaltic-andesite

Porphyritic intermediate volcanic rock; chiefly plagioclase and pyroxene/amphibole, with altered mafic minerals and iron oxides

Bismuth

Bismuth (Bi)

Granite pebble

Granite, chiefly quartz, feldspar, and mica

Concrete Rubble with Aggregate

Hardened Portland Cement Paste with Coarse Aggregate

Quartz Pebble (with Iron Inclusions)

Silicon Dioxide (SiO2)

Polished brecciated jasper (likely septarian or iron-rich jasper)

Microcrystalline quartz (chalcedony), SiO₂, with iron oxides and possibly calcite or other rock fragments

Pyrite in Gossan

Iron Sulfide (FeS2) in Ferruginous Rock

Nuummite

Nuummite (Orthorhombic amphiboles: Anthophyllite and Gedrite)

Granite

Intrusive igneous rock composed mainly of quartz, alkali feldspar, and plagioclase

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Weathered quartz-rich rock, possibly granite or granitic pegmatite

Indeterminate quartz–feldspar aggregate; likely granite/pegmatite

Unakite

Epidote-Feldspar rock

Greenstone

Metabasalt (Greenstone Facies)

Puddingstone (Gowganda Tillite/Jasper Conglomerate)

Jasper Conglomerate (SiO2 primary composition)

Tektite (likely indochinite)

Natural silica-rich impact glass; predominantly amorphous SiO₂ with aluminum, iron, magnesium, calcium, and sodium