Metamorphic Rock (Composed Of Multiple Minerals)

Small dark, speckled stone (likely granite or diorite)

Likely fine-grained granitoid; exact identification is uncertain from the small, blurry view

Weathered quartz-rich rock, possibly granite or quartzite

Likely quartz–feldspar aggregate; exact identification is uncertain from the photograph

Banded metamorphic river cobble, likely gneiss or metasedimentary rock

Quartz–feldspar–mica gneiss or quartzite with cross-cutting quartz veins

Quartz with Mafic/Chlorite Veins

Silicon Dioxide (SiO2) with Chlorite/Epidote cross-veining

Unakite

Altered Granite (Epidotized Granite)

Amphibolite

Amphibolite, typically composed mainly of hornblende and plagioclase feldspar

Mixed mineral and rock collection

Predominantly quartz varieties, including amethyst, plus likely calcite, feldspar, mica, and miscellaneous polished stones

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Quartz Veined Mudstone

Metasedimentary rock with Quartz (SiO2) veins

Likely raw quartz-bearing stone, possibly greenish quartz or calcite

Uncertain from photograph; possible quartz (SiO₂) or calcite (CaCO₃)

Mixed river gravel (alluvial conglomeratic sediment)

Polymictic alluvium; composition includes quartz, feldspar, chert, granite, basalt, and metamorphic rock fragments

Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Likely amphibolite

Amphibolite, composed chiefly of hornblende and plagioclase feldspar

Mixed rock and mineral collection

Unidentified assortment of geological specimens; individual species cannot be determined from the image

Mixed Gravel and Pebbles

Polylithic Alluvial Aggregate

River Pebble (Gneiss/Schist mix)

Metamorphic rock aggregate

Quartz (likely) or a Quartzite Pebble

Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.

Foliated gneiss, possibly migmatitic gneiss

Gneiss; primarily quartz, feldspar, and mica (biotite/muscovite), with possible amphibole

Likely gray granite or gneiss fragment

Granite: quartz, feldspar, and mica; possibly banded gneiss if foliation is present

Unidentified small rock or mineral fragment

Indeterminate from the blurred image; possibly quartz-rich stone, feldspar, or weathered concrete-like geological material

Marble

Recrystallized Calcite (CaCO3)

Coarse sand with a small pebble

Unconsolidated siliciclastic sediment, chiefly quartz and rock fragments

Banded gneiss

Gneiss, likely quartz–feldspar–mica gneiss

Quartzite (with Quartz Veining)

Quartzite (SiO2)

Yellow Quartzite River Cobble

Meta-quartzite (SiO2 with iron oxide staining)

River Quartzite Slik

Quartzite (SiO2)

Quartzite Cobble

Metamorphic Rock (SiO2 dominated)

Lapis Lazuli (polished cabochon/sphere)

Na8[Al6Si6O24]Sn with accessory minerals (Pyrite, Calcite)

Quartz Pebble

Silicon Dioxide (SiO2)

Mixed gravel and mineral fragments

Polymictic unconsolidated sediment; likely quartz, feldspar, chert, mica, and lithic fragments

Gneiss

Felsic banded gneiss, chiefly quartz–feldspar–mica

Likely amphibolite

Amphibolite, composed chiefly of hornblende and plagioclase

Unidentified gray mineral/rock fragment

Indeterminate from image; possibly quartz-rich material or mica-bearing schist

Quartzite Pebble

Meta-quartzite (SiO2)

Copper Ore (Malachite, Azurite, and Chalcopyrite in Host Rock)

Copper-bearing polymetallic mineral aggregate (Cu-minerals)

Quartzite River Rock

Metamorphic Rock (Quartzite)

Gneiss Pebble

Gneiss

Quartz Pebble

Silicon Dioxide (SiO2)

Likely pink feldspar-rich granite or pegmatite fragment

Uncertain from the image; possibly potassium feldspar (orthoclase/microcline) with quartz

Quartzite (River Cobble)

SiO2 (Quartz-rich Metamorphic Rock)

Epidosite (Unakite-related)

Epidosite (composed primarily of Epidote and Quartz)

Gemstone Ring

Various (Likely Glass, Cubic Zirconia, or assorted semi-precious stones)