Mixed (Sedimentary, Igneous, And Metamorphic)

Bumblebee Jasper

Anhydrite with Sulfur, Hematite, and Orpiment (SiO2/CaSO4 mixture)

Tumbled jasper or chert pebble

Microcrystalline quartz (SiO₂), likely jasper/chert with iron-oxide staining

Crushed limestone gravel

Limestone; predominantly calcite (CaCO₃), possibly dolomitic limestone with dolomite (CaMg(CO₃)₂)

Pyrite in Quartz

FeS2 (Iron Pyrite) with SiO2 (Quartz)

Mixed beach gravel and cobbles

Polylithic alluvial or littoral clasts, including quartz, quartzite, chert, limestone, sandstone, and flint

Quartz with Iron Oxide Staining

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Apatite

Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)

Apatite

Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)

Apatite

Fluorapatite / Chlorapatite (Ca5(PO4)3(F,Cl,OH))

Sandstone and Mixed Rock Assemblage

Clastic Sedimentary Rock / Quartz Arenite

Asphalt / Bituminous Aggregate

Bituminous mixture (Hydrocarbon-based sediment)

Limonite (Ironstone Concretion)

Limonite (Hydrous Ferric Oxides mixed with Goethite)

Strawberry Quartz

Quartz with Hematite inclusions (SiO2 + Fe2O3)

Mixed collection of tumbled minerals and rough specimens

Multiple species visible; likely fluorite, quartz/chalcedony, pyrite, tiger’s eye, rose quartz, and possibly labradorite or agate

Mixed rock and mineral gravel

Predominantly granite/granodiorite, basaltic rocks, quartz, and possible gneiss; exact identification is uncertain from the image

Conglomerate

Conglomerate (clastic sedimentary rock)

Weathered sandstone or granitic rock fragment

Indeterminate siliciclastic rock; likely quartz–feldspar–mica aggregate

River Pebbles (White Quartz and Basalt mix)

Mixed Clastic Sedimentary Assemblage (SiO2 and Mafic Volcanics)

Granite (Pink/Potassium Feldspar Granite)

Felsic Plutonic Rock (Potassium Feldspar, Quartz, Mica, and Amphibole)

Mixed sandstone and iron-rich sedimentary rock fragments

Quartz arenite/subarkose, with ferruginous cement and possible iron-oxide staining

Dalmatian Jasper

Microcrystalline Quartz with Arfvedsonite/Tourmaline inclusions

River Siltstone / Mudstone Pebble

Siltstone (composed of mixed silicate and carbonate minerals)

Granite (weathered fragment)

Granite; chiefly quartz, alkali feldspar, plagioclase, and mica

Volcanic breccia or conglomeratic volcanic rock

Lithic volcanic breccia; possibly andesitic–basaltic matrix with feldspar-rich clasts

Weathered granite or granitic rock fragment

Granite; chiefly quartz, feldspar, and mica

Porphyritic granite pebble

Granite, chiefly quartz (SiO₂), alkali feldspar and plagioclase, with minor biotite/hornblende

Granitic Quartz or Pegmatite

Quartz with Orthoclase Feldspar (SiO2 + KAlSi3O8)

Quartz-rich conglomeratic breccia

Polymictic clast-supported conglomerate/breccia, dominated by quartz and feldspar

Tumbled rhodonite

Rhodonite, manganese inosilicate (MnSiO₃), commonly mixed with quartz and manganese oxides

Mixed rock fragments, likely basalt and weathered granite

Basalt (mafic volcanic rock) and granitic fragments (quartz–feldspar–mica aggregate)

Polished brecciated jasper bracelet

Jasper, microcrystalline quartz (SiO₂), commonly with hematite and iron-oxide inclusions

Epidotite (Unakite variety)

Epidotized Granite (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Epidote in Quartz

{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH) mixed with SiO2

Unakite (likely)

Epidote–pink feldspar–quartz rock; commonly termed unakite

Snowflake Obsidian (possibly mixed with Jasper or other matrix)

Obsidian with Cristobalite inclusions

Mixed landscaping gravel with a pink granite cobble

Primarily granite (quartz, alkali feldspar, plagioclase, biotite); mixed pebble assemblage

Mixed rounded rock and mineral gravel

Predominantly weathered basalt, quartz-rich fragments, and iron-stained silicate rocks; exact species cannot be determined reliably from the image

Likely weathered limestone

Calcite-rich limestone (mostly CaCO₃), possibly dolomitic limestone

Mixed Agate and Lapis Lazuli Bracelet

Chalcedony (SiO2) and Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Weathered granite or granitic gneiss

Granite; chiefly quartz, feldspar, and mica, with iron-oxide weathering

Quartz Pebble

Silicon Dioxide (SiO2)