Metamorphic Rock (Composed Of Multiple Minerals)

Quartzite

Quartzite (composed primarily of SiO2)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Tumbled quartz-rich stone, possibly milky quartz or quartzite

Quartz (SiO₂), potentially quartzite if composed of recrystallized quartz grains

Sandstone

Clastic Sedimentary Rock

Granite

Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Greenschist

Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)

Gabbro

Phaneritic Basic Igneous Rock

Greenstone

Protolith: Basaltic rock

Botryoidal Chalcedony

Silicon Dioxide (SiO2)

Sandstone

Sandstone (SiO2-rich framework with variable matrix)

Sandstone pebble

Sandstone (SiO2 with iron oxides)

Granite / Diorite (Granitoid)

Granitoid rock (composed mainly of Quartz, Feldspar, and Amphibole/Biotite)

Weathered iron-stained quartzite or chert nodule

Siliceous rock composed chiefly of microcrystalline quartz (SiO₂), with iron-oxide staining and possible clay/minor carbonate minerals

Slate

Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)

Rounded quartz-rich pebble

Quartzite (probable), composed predominantly of quartz (SiO₂)

Greenstone (Greenschist facies)

Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)

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

Quartzite Pebble

Quartzite (composed primarily of Silica, SiO2)

Quartzite

Quartzite, composed predominantly of recrystallized quartz (SiO₂)

Dark gray-green river stone, likely basalt or metabasalt

Basalt (fine-grained mafic volcanic rock), possibly weakly metamorphosed to metabasalt

Micaceous schist

Mica schist, chiefly muscovite/biotite with quartz and feldspar

Sandstone

Arenite (SiO2 secondary)

Water-worn brown pebble, likely basalt or other fine-grained volcanic rock

Undetermined mafic volcanic rock; basalt is a plausible identification

Bauxite

Bauxite (Al(OH)3, AlO(OH))

Greenschist / Greenstone

Greenschist (composed of chlorite, epidote, actinolite, albite)

Fossilized Sand Dollar

Echinoidea (Clypeasteroida)

Greenstone / serpentine-rich metamorphic rock

Likely serpentinite, composed mainly of serpentine-group minerals (antigorite, lizardite, or chrysotile), with possible magnetite and chlorite

Fossilized Shark Tooth

Carcharocles sp. or Striatolamia sp. (Phosphate/Carbonate mineralized Hydroxyapatite)

Lapis Lazuli

Na8(Al6Si6O24)S2 (composed primarily of Lazurite, Calcite, and Pyrite)

Serpentinite

Serpentinite (composed largely of serpentine group minerals including Antigorite, Lizardite, and Chrysotile, (Mg,Fe)3Si2O5(OH)4)

Jasper (likely Polychrome or Ocean Jasper)

Silicon Dioxide (SiO2) with impurities

Laterite

Laterite (no specific mineral formula as it's a rock type)

Quartzite

Quartzite, composed predominantly of recrystallized quartz (SiO₂)

Quartz (likely Rose Quartz or Milky Quartz based on color)

Quartz (SiO2 - Silicon Dioxide)

Weathered schist

Mica schist, typically quartz–mica schist

Weathered granite fragment

Granite, a coarse-grained plutonic rock composed mainly of quartz, feldspar, and mica

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Quartzite

Quartzite (composed primarily of Silicon Dioxide, SiO2)

Granite / Diorite (Granodiorite)

Granodiorite / Quartz Diorite

Gneiss

Foliated Metamorphic Rock

Biotite-bearing granite

Granite, composed chiefly of quartz, feldspar, and biotite; exact identification is uncertain from the photo.

Mookaite Jasper

Silicon Dioxide (SiO2) - Radiolarite