Mineral Like (Anthropogenic)

Quartz Druzy (on Calcedony/Quartz base)

Silicon Dioxide (SiO2)

Milky Quartz with Talc / Serpentine

Silicon Dioxide (SiO2) with Mg3Si4O10(OH)2

Prehnite

Prehnite Ca2Al2Si3O10(OH)2

Pegmatite

Granitic Pegmatite

Pegmatitic Granite

Granite with Orthoclase Feldspar and Quartz (SiO2, KAlSi3O8)

Septarian Nodule with Calcite

Septarian Concretion (CaCO3 with internal calcite crystals)

Tooth or shell fragment (likely fossilized marine material)

Indeterminate; possibly a fossil fish tooth or mollusk shell fragment composed mainly of calcium carbonate (CaCO₃)

Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Sandstone with Quartz Vein

Arenite with hydrothermal quartz intrusion

Gneiss

Gneiss (High-grade metamorphic rock)

Jasper-bearing Quartzite River Cobble

Tectonized Quartzite with Iron-Oxide (Hematite/Limonite) Veining

Granite

Granite (dominated by Quartz, Alkali Feldspar, and Plagioclase)

Granite

Granite (Felsic intrusive igneous rock)

Granite

Granite (Phaneritic igneous rock)

Sandstone (Greywacke)

Arenite / Clastic Sedimentary Rock

Amygdaloidal Basalt

Basalt with secondary mineral infilling (commonly SiO2 or Zeolites)

Bumblebee Jasper

Fibrous Calcite with Arsenic and Sulfur Inclusions

Conglomerate

Conglomerate

Fossilized Shark Tooth

Carcharhinus sp. (likely Bull or Requiem shark family)

Rose Quartz

Quartz (Silicon Dioxide, SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Fuchsite

Chromian Muscovite, K(Al,Cr)2(AlSi3O10)(OH)2

Sulfur

Native Sulfur (S)

Red Garnet

Pyrope or Almandine (X3Y2(SiO4)3)

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Sulfur (with possible Cullet Glass or Slag imitation)

Native Sulfur (S8)

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Strawberry Quartz

Quartz with Hematite or Goethite inclusions (SiO2 + inclusions)

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Rose Quartz

Silicon Dioxide with trace inclusions (SiO2)

Limonitic Sandstone with Inclusion

Limonitic Quartz Sandstone (primarily SiO2 with FeO(OH)·nH2O)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Larimar

Pectolite (NaCa2Si3O8(OH))

Amazonite

Microcline (KAlSi3O8) with lead inclusions

Epidote with quartz/feldspar

Epidote, Ca2(Al,Fe)3(SiO4)3(OH)

Lepidolite

K(Li,Al)_3(Si,Al)_4O_10(F,OH)_2 (Lithium-bearing Mica)

Lepidolite

K(Li,Al)3(Al,Si,Rb,Cs)4O10(F,OH)2

Bornite

Cu5FeS4

Iron-stained Quartzite / Agate

Silicon Dioxide with Iron Oxides (SiO2 + Fe2O3·nH2O)