Sedimentary Rock (Altered)

Peridotite

Ultramafic igneous rock

Likely serpentinite (greenstone pebble)

Serpentinite, composed mainly of serpentine-group minerals (e.g., lizardite, chrysotile, or antigorite)

Peridotite

Ultramafic intrusive igneous rock

Red-brown iron-rich rock, likely hematite-bearing basalt or ironstone

Provisional identification: hematite (Fe₂O₃)-stained mafic rock; possibly weathered basalt or ferruginous chert

Weathered metamorphic rock, likely schist or slate

Foliated pelitic metamorphic rock; commonly muscovite–chlorite schist or phyllite

Likely raw amber-bearing rock or amber-like resin

Amber (fossilized plant resin), chiefly polymerized terpenoid compounds; exact identification is uncertain from the image

Weathered limestone or calcareous rock

Calcite-rich carbonate rock; primarily calcium carbonate (CaCO₃)

Likely a small rough mineral specimen

Unidentifiable from the image; possibly a mica-bearing rock or green mineral

Polished purple-and-cream jasper (likely)

Silica-rich microcrystalline quartz/chalcedony, SiO₂, colored by iron/manganese minerals

Milky quartz in weathered host rock

Quartz, SiO₂; likely a quartz vein in altered country rock

Weathered porphyritic volcanic rock (likely andesite or basalt)

Porphyritic andesite/basalt; typically plagioclase feldspar ± pyroxene, olivine, and iron oxides

Iron-stained quartz vein rock

Quartz-rich vein material, predominantly SiO₂, with iron oxyhydroxides (goethite/limonite) and likely sulfide alteration

Tumbled jasper or altered chalcedony

Microcrystalline quartz (SiO₂), possibly jasper/chalcedony

Kimberlite

Ultramafic igneous rock

Epidote or Unakite Rock

Epidote-bearing rock / Ca2(Al,Fe)3(SiO4)3(OH)

Turquoise

Turquoise - CuAl6(PO4)4(OH)8·4H2O

Peridotite

Ultramafic igneous rock (primarily olivine and pyroxene)

Weathered greenstone (altered mafic rock)

Greenschist-facies metabasalt; typically chlorite, actinolite, epidote, and albite

Greenstone (likely altered mafic rock)

Chlorite- and amphibole-bearing metabasalt; exact identification requires testing

Banded jasper / iron-rich chert (probable)

Microcrystalline quartz (SiO₂) with iron oxides/hydroxides and clay minerals

Red jasper in a gray host rock (likely jasperized volcanic rock)

Microcrystalline quartz (SiO₂), iron-oxide–colored jasper, in a fine-grained volcanic or sedimentary matrix

Greenstone pebble

Greenstone (metamorphosed mafic rock, commonly altered basalt); exact identification requires testing

Blue-gray metamorphic rock, possibly slate or phyllite

Likely quartz–mica-rich phyllite/slate; exact identification requires testing

Greenstone (altered volcanic rock)

Chlorite–epidote–actinolite-bearing metabasalt (tentative identification)

Weathered iron-rich limestone or calcareous sandstone

Calcite-rich carbonate rock, possibly ferruginous limestone (CaCO₃ with iron oxides)

Polished river cobble, likely jasper or iron-stained chert

Microcrystalline quartz (SiO₂), potentially hematite/goethite-bearing

Serpentinite (likely)

Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, or chrysotile)

Polished striped jasper pebble

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

Unakite

Unakite (Altered Granite)

Unakite

Unakite (altered granite)

River Cobble (Weathered Granitoid)

Granodiorite / Quartz Diorite

Likely serpentinite (serpentine-rich rock)

Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite, lizardite, or chrysotile)

Weathered greenish rock pebble

Possibly altered basalt or greenstone; exact identification is uncertain from the photograph

Jasper

Silicon dioxide (Microcrystalline Quartz)

Polished jasper

Microcrystalline quartz (SiO₂), commonly with iron-oxide and clay inclusions

Likely vesicular basalt with weathering minerals

Basalt, primarily plagioclase and pyroxene, with possible iron oxides and secondary zeolite/carbonate minerals

Conglomeratic or porphyritic basalt cobble

Likely vesicular basalt with weathered feldspar/mafic inclusions; exact identification requires testing

Rounded, weathered metamorphic rock (likely quartz-rich gneiss or schist)

Undetermined; likely quartz–feldspar-rich gneiss, with possible mica and iron-oxide staining

Fossilized shell

Indeterminate bivalve shell; likely calcitic or aragonitic shell material (CaCO₃)

Likely weathered limestone or calcareous sandstone

Calcite-rich carbonate rock; predominantly CaCO₃, possibly micritic limestone

Weathered limestone or calcitic cave deposit

Calcite (CaCO₃), likely porous limestone/travertine

Green Greenstone / Celadonite-bearing Metamorphic Rock

Greenschist / Celadonite / Serpentinitic pebble