Minerals

Mottled granite

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

Gneiss

Gneiss

River Stone / Pebble

Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)

Basalt (Greenstone/Water-worn Pebble)

Basalt (containing Chlorite/Epidote)

Greenstone

Greenschist (containing chlorite, epidote, and actinolite)

Basalt (Greenstone)

Basalt with chlorite/epidote (often referred to as Greenstone)

Limonite Geode / Ironstone Nodule

Hydrated Iron Oxide Hydroxide (FeO(OH)·nH2O)

Kyanite

Al2SiO5

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz Crystal Clusters

Silicon Dioxide (SiO2)

Clear quartz crystal cluster

Quartz, silicon dioxide (SiO₂)

Quartz

Silicon Dioxide (SiO2)

Iron-stained metamorphic rock, possibly schist

Likely quartz-mica schist with iron-oxide staining; exact identification requires testing

Quartz-rich rock, likely milky quartz vein material

Quartz (SiO₂), possibly with iron-oxide staining and minor associated minerals

Quartz Pebble

Silicon dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Indigo Gabbro

Gabbro (MaFIC intrusive rock)

Blue Quartz

Silicon Dioxide (SiO2)

Copper Ore (Malachite and Azurite stained rock)

Copper-bearing rock with secondary copper carbonates

Milky quartz

Quartz (silicon dioxide, SiO₂)

Small blue-gray mineral fragment (undetermined)

Unidentified from the image; no reliable mineral identification is possible from color and appearance alone.

Quartz pebble in a coarse mineral-rich rock

Quartz (SiO₂), possibly in a quartz-rich conglomerate or breccia

Mottled purple-and-cream rough mineral specimen, likely lepidolite-bearing pegmatite

Probably lepidolite (lithium mica; K(Li,Al)₃(Si,Al)₄O₁₀(F,OH)₂) with light-colored quartz or feldspar; identification uncertain from image

Small amber-colored mineral fragment (identity uncertain)

Undetermined; appearance alone is insufficient for a reliable mineral identification

Limonite Concretion

Hydrated iron oxide-hydroxide, FeO(OH)·nH2O

Likely blue-gray gneiss

Gneiss, a foliated metamorphic rock; exact mineral composition cannot be confirmed from the image

Vesicular basalt (likely iron-rich scoria)

Basaltic volcanic rock; chiefly plagioclase, clinopyroxene, olivine, and Fe-Ti oxides

Weathered vesicular volcanic rock, likely basaltic scoria

Vesicular basalt/scoria; chiefly plagioclase, pyroxene, olivine, and volcanic glass

Rounded green-gray pebble, likely serpentinite or altered basalt

Probable serpentinite (hydrated ultramafic rock) or greenstone; image insufficient for certain identification

Quartz Pebble

Silicon dioxide (SiO2)

Weathered green-gray stone, likely serpentinite or chlorite-rich metamorphic rock

Probable serpentinite (antigorite–lizardite), possibly chlorite schist or altered basalt

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Gneiss (Metamorphic Cobble)

Gneiss

Quartz Pebble

Silicon Dioxide (SiO2)

Tumbled gabbro or basalt

Dark mafic igneous rock, likely gabbro (plutonic) or basalt (volcanic), composed mainly of plagioclase and pyroxene

Basalt

Extrusive Igneous Rock

Granite

Phaneritic felsic intrusive igneous rock

Weathered, light-colored rock (specific identification uncertain)

Possibly granitic rock; mineral species cannot be identified reliably from the image

Serpentinite

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