Sedimentary Rock (Altered)

Tumbled yellow-green stone, possibly serpentine

Likely serpentine-group mineral (Mg₃Si₂O₅(OH)₄); exact identification requires testing

Quartz-rich metallic sulfide ore (probable pyrite-bearing rock)

Pyrite, FeS₂, in a quartz-rich host; exact identification is uncertain from the image

Weathered iron-rich limestone or marl

Calcitic carbonate rock with limonite/goethite and clay impurities (predominantly CaCO₃)

Mookaite Jasper

Silicified Radiolarite (SiO2)

Greenstone (likely chlorite-rich metamorphic rock)

Greenschist; commonly composed of chlorite, actinolite, and epidote, with possible albite

Unakite

Unakite (Altered Granite)

Vesicular volcanic rock, likely pumice or weathered scoria

Pumice/scoria; predominantly volcanic glass and plagioclase, with possible pyroxene or iron oxides

Weathered mafic rock (likely basalt or greenstone)

Altered basalt, possibly metamorphosed to greenschist; exact identification requires testing

Weathered sandstone or volcanic rock fragment

Indeterminate; likely quartz–feldspar-rich sandstone, possibly altered volcanic rock

Rounded quartz-rich river pebble

Likely quartzite or quartz-rich sandstone; exact identification requires a fresh surface and tests

Jasper

Microcrystalline Quartz (SiO2)

Polished banded jasper (likely red jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides; exact variety uncertain

Likely greenstone (metamorphosed mafic rock)

Greenstone; commonly chlorite–actinolite–epidote–albite assemblage

Polished brecciated jasper (likely septarian or iron-rich jasper)

Microcrystalline quartz (chalcedony), SiO₂, with iron oxides and possibly calcite or other rock fragments

Epidote

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

Rounded metamorphic rock (likely gneiss or schist)

Foliated quartz–feldspar–mica rock; precise identification requires closer examination

Tumbled brown river stone

Likely weathered iron-rich basalt, greenstone, or other mafic metamorphic rock; exact identification requires testing

Rounded pale beach cobble, likely quartzite or massive quartz

Quartzite (mostly microcrystalline SiO₂); exact identification requires testing

Quartz-rich rock, possibly chrysoprase/chalcedony

Microcrystalline quartz (SiO₂), with iron-oxide staining and green inclusions; exact identification requires testing

Weathered volcanic rock, likely basalt

Basalt; commonly composed of plagioclase, pyroxene, and iron-rich oxides

Weathered basaltic rock

Basalt, likely amygdaloidal or altered basalt

Greenstone with quartz veins

Chlorite- and epidote-bearing metabasalt (greenstone), cut by quartz veins

Weathered greenstone (possible serpentinite)

Greenstone, a broad term for metamorphosed mafic rock; exact identification is uncertain from the photograph

Weathered granite or granitic gneiss

Granitic rock, chiefly quartz, feldspar, and mica; exact identification is uncertain from the photograph

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Epidote with Quartz/Feldspar

Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) with associated minerals in a host rock

Likely serpentinite (green serpentine rock)

Serpentinite, composed chiefly of serpentine-group minerals (antigorite, lizardite, and/or chrysotile)

Small rounded green-gray pebble, likely greenstone

Greenstone (metamorphosed mafic rock; commonly chlorite- and epidote-bearing)

Dark, foliated metamorphic rock (likely schist)

Probably mica schist; exact identification requires closer inspection or testing

Weathered green metamorphic rock, possibly serpentinite or greenstone

Likely serpentinite (serpentine-group minerals) or chlorite/epidote-rich greenschist; exact identification requires testing

Rounded greenstone pebble

Likely serpentinite or chlorite-rich metamorphic rock; exact identification requires testing

Polished red gemstone pendant, likely red jasper or brecciated jasper

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

Porous limestone (likely reef or shell limestone)

Calcium-carbonate rock, predominantly calcite (CaCO₃); possibly bioclastic limestone or coquina

Weathered granite (likely granitic rock)

Granite; primarily quartz, feldspar, and mica (variable composition)

Weathered feldspar-rich rock, possibly amazonite-bearing granite

Likely granite or pegmatite containing microcline feldspar (KAlSi₃O₈), with quartz and altered minerals

Granite

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica

Lapis Lazuli (in Matrix)

Lazurite-bearing Metamorphic Rock (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2

Dark, coarse-grained rock (possibly diorite or amphibolite)

Undetermined; likely a mafic to intermediate rock containing plagioclase and dark amphibole or pyroxene

Weathered basalt or volcanic rock

Likely vesicular basalt; composition dominated by plagioclase and pyroxene, with possible iron-oxide alteration

Green serpentine pebble (possibly serpentine-rich rock)

Serpentinite, composed chiefly of serpentine-group minerals such as antigorite, lizardite, or chrysotile; exact identification requires testing

Quartz Vein in Greenstone

Hydrothermal Quartz (SiO2) with Chlorite/Epidote Schist host rock

Water-worn green pebble

Likely altered basalt or greenstone; precise identification requires testing