Synthetic (Not A Rock Or Mineral)

Gravel / Crushed Stone

Aggregate (mixed mineral rock fragments)

Mixed Rock and Mineral Collection

Various geological specimens

Geode

Quartz nodule / Chalcedony-lined cavity

Crushed Granite and Basalt

Phaneritic Igneous Rock / Aphanitic Igneous Rock

Abbey Bominable (Monster High character)

Anthropomorphic Yeti / Digital Animation

Druzy Quartz on Limestone

Silicon Dioxide (SiO2) on Calcium Carbonate (CaCO3)

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)

Sandstone

Arenite

Geode (Quartz / Chalcedony Geode)

SiO2 (Silicon Dioxide)

Aquamarine

Beryl (Be3Al2Si6O18), specifically the blue-green variety

Quartz with Sericite and Cinnabar

Silicon Dioxide (SiO2) with muscovite/sericite and mercury sulfide (HgS)

Vesicular Basalt

Vesicular Basalt

Pebble

Clast (specifically a granule or small pebble)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Granite

Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)

Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Sandstone with Iron Banding

Arenite with Hematite or Limonite staining (SiO2 with Fe2O3)

Blue Tiger's Eye

Riebeckite (crocidolite variety)

Copper Ore (Malachite and Azurite stained rock)

Copper-bearing rock with secondary copper carbonates

Moonstone

Adularia or Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8), specifically with lamellar exsolution of albite and orthoclase.

Quartz Geode

Silicon Dioxide (SiO2)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Aquamarine

Aquamarine (Beryl variety); Be3Al2Si6O18

Weathered granite or granitic gneiss

Granite: quartz, feldspar, and mica; possibly gneiss if the dark minerals are banded

Gravel and Sediment Sample

Mixed clastic sediment

Moonstone

Orthoclase Feldspar (KAlSi3O8)

Gravel

Unconsolidated rock fragments / detrital sediment

Basalt with Quartz Vein

Extrusive Igneous Rock / Volcanic Rock

Desert Rose (Baryte or Selenite variant)

Barium Sulfate (BaSO4) or Gypsum (CaSO4·2H2O) with Sand inclusions

Veined Quartzite / Vein-filled Sedimentary Rock

Siliciclastic rock with iron oxide-filled fractures

Apatite

Apatite group mineral (e.g., Fluorapatite - Ca5(PO4)3F, Chlorapatite - Ca5(PO4)3Cl, Hydroxylapatite - Ca5(PO4)3(OH))

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.

Vuggy Quartz on Matrix

Crystalline Silicon Dioxide (SiO2)

Geode

Quartz / Chalcedony nodule

Emerald

Beryl (variety Emerald), Be3Al2Si6O18 with Cr and/or V

Quartz Geode

Silicon dioxide (SiO2)

Yellow Agate (Banded Chalcedony)

Silicon Dioxide (SiO2)

Sandstone and Conglomerate pebbles

Sedimentary clastic rock

Quartz Geode

Quartz (Silicon Dioxide, SiO2)

Quartzite Pebble

Quartzite (mostly SiO2)

Milky Quartz with Chlorite Schist Inclusions

Quartz (SiO2) with Chlorite Group silicates (typically (Mg,Fe)3(Si,Al)4O10(OH)2)

Copper-bearing Quartz Vein in Host Rock

Quartz with Malachite/Chrysocolla staining