Minerals

Petrified Wood

Silicified Wood (SiO2)

Ironstone Concretion / Limonite-stained Siltstone

Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)

Basalt with Epidote/Chlorite

Amygdaloidal Basalt (SiO2 with (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)))

Iron-rich laterite (hematitic limonite)

Laterite composed mainly of hematite (Fe₂O₃), goethite (FeO(OH)), and hydrated iron oxides

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Mica-rich pegmatite

Granitic pegmatite, likely quartz–feldspar–mica assemblage

Mica-rich schist (probable)

Mica schist, likely muscovite–chlorite schist; exact minerals cannot be confirmed from the image

Red Sandstone

Arenite (with Iron Oxide / Hematite cementation)

Quartz

Silicon dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Quartz with Iron Staining

Silicon Dioxide (SiO2)

Clear quartz beads (likely rock crystal)

Quartz, silicon dioxide (SiO₂)

White quartz crystal cluster (likely druzy quartz)

Quartz, SiO₂; likely a quartz-lined cavity fragment

White quartz pebble (possibly milky quartz)

Quartz, SiO₂

Quartz-rich rock, possibly milky quartz with iron staining

Quartz (SiO₂), likely with limonite/goethite inclusions and minor feldspar or carbonate

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Pale green rounded boulder, likely altered serpentinite or greenstone

Probable serpentinized ultramafic rock; exact identification requires testing

Quartz Pebble

Silicon Dioxide (SiO2)

Tumbled pale greenish stone, likely serpentine or altered limestone

Probable serpentine-group rock (antigorite/lizardite), possibly serpentinite; identification is visual only

Dark weathered igneous rock, likely basalt

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz with inclusions

Silicon Dioxide (SiO2)

Sand Grain (Silica/Quartz Grain)

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Quartz-rich pegmatite (likely)

Quartz–feldspar pegmatite; chiefly SiO₂ quartz with feldspar and possible mica

Weathered foliated metamorphic rock, likely schist or gneiss

Micaceous quartz–feldspar metamorphic rock; exact mineralogy requires testing

Assorted mineral and rock collection

Mixed specimens; individual species cannot be reliably identified from the image

Quartz Crystal

Silicon Dioxide (SiO2)

Shale

Shale (clastic sedimentary rock)

Granite pebble

Granite, a coarse-grained felsic intrusive igneous rock

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Rounded granite pebble

Granite, a quartz–feldspar–mica plutonic rock

Ironstone concretion

Iron-oxide-rich sedimentary concretion, likely dominated by goethite and/or hematite

Ironstone concretion

Iron-oxide-cemented sedimentary concretion, commonly hematite/goethite with quartz or clay

Small dark mineral or rock fragment (not identifiable from the image)

Undetermined; the specimen is too small and lacks visible diagnostic features for a reliable identification.