Mineral, Possibly Rock Fragment Containing A Mineral

Dark gray fine-grained rock, possibly basalt

Basalt; primarily plagioclase feldspar and pyroxene, with possible olivine or magnetite

Iron-rich breccia or weathered limonite-bearing rock

Goethite–limonite ironstone, possibly ferruginous breccia

Greywacke (River Slikenside)

Greywacke (Lithic Sandstone)

Sandstone (Micaceous)

Arenite (composed primarily of SiO2)

Quartz with chlorite inclusions

Quartz (SiO₂), likely containing green chlorite-group minerals

Conglomerate

Conglomerate (Clastic sedimentary rock)

Polished amber

Amber (fossilized plant resin; chiefly amorphous organic compounds)

Fossilized bone fragment, possibly vertebrate tooth or jaw

Mineralized vertebrate bone; commonly apatite [Ca5(PO4)3(F,OH,Cl)] replacing original bone

Milky quartz vein fragment

Quartz, silicon dioxide (SiO₂), commonly with minor iron-oxide staining and possibly feldspar

Likely weathered quartz-bearing rock

Uncertain; possibly quartz-rich feldspathic material, with iron-oxide staining

Weathered brown stone, possibly basalt or iron-rich sedimentary rock

Indeterminate from photograph; likely fine-grained mafic rock (basalt) or ferruginous sandstone

Uncertain greenish stone, possibly serpentine or altered basalt

Serpentine-group minerals, commonly Mg₃Si₂O₅(OH)₄; identification is provisional from the photograph

Sandstone (Quartz-rich)

Arenite (SiO2 based clastic rock)

Metallic sulfide-bearing rock, likely galena-rich ore

Galena (lead sulfide, PbS), possibly mixed with pyrite and host rock

Quartz crystal cluster (likely rose or milky quartz)

Quartz, silicon dioxide (SiO₂); trigonal crystal system

Granite

Granite

Banded metamorphic pebble (possibly gneiss)

Likely banded gneiss; exact identification is uncertain from the photograph

Small pale stone fragment (undetermined)

Unidentified; the image lacks diagnostic detail for a reliable identification

Pegmatite or Graphic Granite

Intrusive Igneous Rock

Milky Quartz with Mineral Inclusions

Silicon Dioxide (SiO2)

Granite

Felsic intrusive igneous rock

Conglomerate

Conglomerate (clastic sedimentary rock)

Blue-gray quartz-bearing rock, likely rough chalcedony or silicified host rock

Microcrystalline quartz (SiO₂), possibly with iron-oxide staining and minor feldspar/clay minerals

Greenish chert or serpentine-rich rock

Likely microcrystalline quartz (SiO₂), possibly with chlorite/serpentine inclusions

Sandstone

Arenite (SiO2 primarily)

Basaltic Tuff / Volcanic Breccia

Pyroclastic Breccia / Lithic Tuff

Kimberlite with Diamonds

Kimberlite (ultramafic potassic igneous rock)

Unidentified pale yellow-green mineral/rock fragment

Possibly sulfur-bearing mineral, serpentine, or weathered limestone; exact identification requires testing

Sandstone (likely Graywacke or Lithic Arenite)

Clastic sedimentary rock predominantly composed of silicate grains

Quartz crystal fragment in weathered host rock

Quartz (SiO₂), possibly in a feldspathic or iron-stained matrix

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Small weathered pebble, possibly limestone

Indeterminate carbonate-rich rock; likely calcite-bearing limestone

Weathered quartz-rich rock fragment

Likely quartz-bearing sandstone or granitic rock; exact identification is uncertain from the image

Pegmatitic granite with lilac lepidolite and mica

Granitic pegmatite; quartz–feldspar–mica rock, possibly containing lepidolite (lithium mica)

Small brown mineral fragment (undetermined)

Unidentified; image detail is insufficient for a reliable species identification

Small unidentified mineral specimen

Indeterminate from image; possibly a quartz-family crystal or sulfide mineral

Small weathered rock fragment (likely iron-rich basalt or laterite)

Tentative: basaltic lithic fragment, possibly limonitic/iron-oxide coated

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Likely quartz-rich rock fragment

Probably microcrystalline quartz (SiO₂), possibly a pale chert or quartzite fragment

Dark fine-grained rock fragment

Likely basalt or basaltic scoria; exact identification requires testing

Likely weathered granite or granitic gneiss fragment

Granite: quartz + feldspar + mica; possibly gneiss if foliation is confirmed