This Is Not A Rock Or Mineral

Turquoise

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

Limestone with Calcite Veins

Calcium Carbonate (CaCO3)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Biotite (Black Mica)

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

Amber beads

Amber, fossilized plant resin; largely polymerized terpenoid resin (not a mineral)

Zebra Stone

Siltstone (Argillaceous Siltstone)

Druzy Quartz on Matrix

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2) in Geodic cavity

K-Feldspar (Potassium Feldspar)

Orthoclase / Microcline (KAlSi3O8)

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 Fragment

Silicon Dioxide (SiO2)

Howlite (polished/tumbled)

Howlite, Ca₂B₅SiO₉(OH)₅

Iron-stained quartz-rich rock (likely limonite-bearing quartzite)

Quartzite, predominantly quartz (SiO₂), with iron oxides/hydroxides such as limonite/goethite

Amygdaloidal Basalt

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

Serpentine (Serpentinite)

Serpentinite / (Mg,Fe)3Si2O5(OH)4

Montana Moss Agate

Chalcedony (SiO2) with Manganese/Iron oxide inclusions

Likely tiger’s-eye rough fragment

Tiger’s-eye (quartz, SiO₂, with fibrous crocidolite-derived inclusions)

Biotite (Mica)

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

Pearl strand

Nacreous pearl, primarily aragonite (CaCO₃) with conchiolin protein

Greywacke with Quartz Veins

Lithic Sandstone (Greywacke) with SiO2 inclusions

Milky Quartz

Silicon Dioxide (SiO2)

Amygdaloidal Basalt

Vesicular-Amygdaloidal Basalt (Mafic Extrusive)

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.

Tumbled milky quartz with iron staining

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

Weathered quartz-rich pebble

Likely quartzite or granitic/granodioritic rock; exact identification is uncertain from the image

Dendritic Agate

Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)

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)

Honey calcite (calcite-rich limestone/marble fragment)

Calcite — CaCO₃; likely coarse crystalline calcitic rock

Polished moss agate (likely dendritic agate)

Chalcedony, microcrystalline quartz (SiO₂), with inclusions of manganese/iron oxides or hornblende

Milky Quartz

Silicon Dioxide (SiO2)

Amygdaloidal Basalt

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

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

Silicon Dioxide (SiO2) veins in matrix

Weathered iron-rich quartzite or sandstone pebble

Ferruginous quartzite; primarily quartz (SiO₂) with iron-oxide coatings

Bouncy Ball (Synthetic Rubber Polymer)

Polybutadiene / Ethylene Vinyl Acetate (EVA)

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(OH)2

Basalt with Quartz Veins

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

Microcline Feldspar (Amazonite or White Feldspar)

KAlSi3O8

Tumbled serpentine

Serpentine-group minerals, chiefly lizardite and antigorite; approximate formula Mg₃Si₂O₅(OH)₄

Limestone with Calcite Veins

Calcium Carbonate (CaCO3)

Quartz-veined Limestone

Sedimentary limestone with hydrothermal quartz/calcite veins (CaCO3 / SiO2)