Mineral, Specifically A Rock Fragment

Greenstone

Greenschist (metamorphosed mafic igneous rock)

Likely weathered stone or mineral fragment

Unidentified fine-grained silicate rock; possible basalt, greenstone, or serpentine

Polished brown mineral or rock fragment

Indeterminate from image; possibly iron-stained quartz, jasper, or a polished sulfide-bearing specimen

Pink Granite

Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)

Weathered quartz-rich rock fragment

Likely quartz-bearing feldspathic rock; exact identification requires testing

Sandstone

Sedimentary Rock (Quartz Sandstone)

Green Moss Agate

Silicon Dioxide (SiO2) with Mineral Inclusions

Basalt

Mafic volcanic rock

Limestone with Fossil Fragment

Sedimentary carbonate rock (CaCO3)

Chalcedony (Agate/Quartz)

Silicon Dioxide (SiO2)

Likely quartz-bearing rock or mineral fragment

Indeterminate; possibly quartz (SiO₂) with iron-oxide staining and darker matrix

Sandstone

Arenite (SiO2 based)

Basalt

Basalt (Mafic volcanic rock)

Small pale stone, likely quartzite or limestone fragment

Indeterminate; possible quartzite (mostly SiO₂) or calcitic limestone (CaCO₃)

Calcite fragment

Calcite, calcium carbonate (CaCO₃)

Weathered tan mineral/rock fragment

Indeterminate from image; possibly iron-stained quartz, feldspar-rich rock, or limonite-bearing material

Granite (Pink/Red variety)

Felsic Intrusive Igneous Rock

Granite Cobble

Phaneritic Felsic Igneous Rock

Pink Granite

Phaneritic Igneous Rock (high K-Feldspar content)

Green Quartzite (Aventurine-like)

Quartzite (primarily SiO2 with chromium-rich mica or chlorite inclusions)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Quartz geode fragment

Microcrystalline and drusy quartz, SiO₂, likely in a weathered carbonate or volcanic host

Uncertain pale mineral/rock fragment

Indeterminate; possibly calcite-rich material or a light-colored carbonate rock

Unknown Rock Fragment

Undetermined

Gneiss (specifically Granite Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

Bumblebee Jasper

Calcite-Auripigment-Pyrite-Realgar assemblage (Carbonate/Sulphide mixture)

Rhodonite

(Mn,Fe,Mg,Ca)SiO3

Likely serpentine-rich rock (serpentinite)

Serpentinite, composed mainly of serpentine-group minerals (e.g., lizardite, antigorite, or chrysotile); exact identification is uncertain from the image alone

Druzy agate/geode fragment

Quartz (SiO₂) crystals lining a chalcedony-rich cavity, likely an agate geode

Possible basalt or weathered mafic rock

Fine-grained mafic igneous rock, likely basalt; exact identification requires testing

Likely porphyritic basalt or andesite fragment

Fine-grained mafic to intermediate volcanic rock; commonly plagioclase ± pyroxene, amphibole, and iron oxides

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Small brown mineral fragment, possibly garnet

Unidentified; garnet is a tentative visual possibility (garnet-group silicates, X₃Y₂(SiO₄)₃)

Chert (White-Tan variety)

Silicon dioxide (SiO2) / Microcrystalline Quartz

Red Granite

Phaneritic Felsic Igneous Rock (Granite)

Yellow Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Likely weathered quartz-rich rock fragment

Indeterminate; possibly quartz-bearing sandstone or chert with iron-oxide staining

Fossil shell fragment in sedimentary rock

Indeterminate marine mollusk shell; likely a bivalve or gastropod fossil

Sandstone

Sedimentary Rock (Quartz Sandstone)

Sandstone

Clastic Sedimentary Rock

Sandstone

Sedimentary Clastic Rock

Sandstone

Clastic Sedimentary Rock