This Is Not A Rock Or Mineral

Quartz (Rock Crystal) with minor impurities

Quartz (SiO2)

Man-made Ceramic / Clay Figurine

Aluminosilicate Ceramic (Processed Clay)

Green glass sphere/marble

Soda-lime glass (primarily SiO2, Na2O, CaO)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Garnet Schist

Almandine Garnet in Mica Schist (Fe3Al2(SiO4)3)

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Granite (Alkali-feldspar Granite)

Felsic Plutonic Rock (Primary minerals: Quartz SiO2, Orthoclase KAlSi3O8, Plagioclase (Na,Ca)AlSi3O8)

Sandstone with Iron Oxide (Limonite/Hematite)

Ferruginous Sandstone (SiO2 with FeO(OH)·nH2O)

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)

Limestone with Calcite Veins

Calcium Carbonate (CaCO3)

Epidote

Epidote (formula: Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Zebra Stone

Siltstone (Argillaceous Siltstone)

Breccia

Breccia - Clastic sedimentary rock

Biotite Mica in Host Rock

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)

Turquoise

CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminium phosphate)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Druzy Quartz on Matrix

Silicon Dioxide (SiO2)

Biotite (Black Mica)

Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2

K-Feldspar (Potassium Feldspar)

Orthoclase / Microcline (KAlSi3O8)

Tumbled quartz-bearing rock, possibly garnet-bearing quartzite

Quartz-dominant silicate rock; visible minerals may include quartz, iron oxides, and dark mica or amphibole

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Tumbled Mineral Collection (Amethyst, Celestite, K2 Jasper, Rose Quartz, Ruby in Zoisite, Que Sera Stone)

Mixed Mineral Specimens (Quartz SiO2, Celestite SrSO4, Corundum Al2O3 with Zoisite, etc.)

Quartz Geode

Silicon Dioxide (SiO2) in Geodic cavity

Amygdaloidal Basalt

Amygdaloidal Basalt with Secondary Infilling (e.g., Agate, Quartz, or Zeolite)

Pearl strand

Nacreous pearl, primarily aragonite (CaCO₃) with conchiolin protein

Montana Moss Agate

Chalcedony (SiO2) with Manganese/Iron oxide inclusions

Biotite (Mica)

Biotite group (K(Mg,Fe)3AlSi3O10(F,OH)2)

Milky Quartz

Silicon Dioxide (SiO2)

Greywacke with Quartz Veins

Lithic Sandstone (Greywacke) with SiO2 inclusions

Amygdaloidal Basalt

Vesicular-Amygdaloidal Basalt (Mafic Extrusive)

Tumbled milky quartz with iron staining

Quartz, silicon dioxide (SiO₂), likely massive quartz or quartz vein material

Dendritic Agate

Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)

Honey calcite (calcite-rich limestone/marble fragment)

Calcite — CaCO₃; likely coarse crystalline calcitic rock

Mixed gemstone jewelry collection

Various gemstone minerals, including likely amethyst (quartz), sapphire or iolite, garnet, pearl, turquoise, and colored beryl or tourmaline

Polished red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Quartz Geode Segment

Crystalline Silicon Dioxide (SiO2)

Veined Pebble (Septarian or Quartz-Veined Chert/Basalt)

Silicon Dioxide (SiO2) veins in matrix

Milky Quartz

Silicon Dioxide (SiO2)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic extrusive volcanic rock with secondary mineral infilling)

Microcline Feldspar (Amazonite or White Feldspar)

KAlSi3O8

Basalt with Quartz Veins

Mafic Igneous Rock (primarily Plagioclase and Pyroxene) with SiO2 inclusions

Limestone with Calcite Veins

Calcium Carbonate (CaCO3)