Rock (Likely Sedimentary)

Small weathered stone, possibly quartz-rich granite or feldspar

Indeterminate granitoid fragment; likely quartz (SiO₂) and feldspar, with minor mica or iron oxides

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz Geode (partially formed/chalcedony with iron staining)

Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides

Vesicular Basalt

Basalt (Mafic volcanic rock)

Weathered granite or granitic pegmatite cobble

Granite/granitic rock, composed mainly of quartz (SiO₂), feldspar, and minor biotite or other dark minerals; the reddish-brown areas may be iron-oxide staining or weathered accessory minerals

Quartz geode or druzy quartz specimen

Quartz, silicon dioxide (SiO₂), likely microcrystalline/drusy quartz coating a host rock

Quartz (likely)

Quartz (SiO2 - Silicon Dioxide)

Basalt with Mineral Vein (Cobble)

Basalt (with likely Quartz/Calcite vein)

Chalcedony (Agate and Carnelian varieties)

Silicon Dioxide (SiO2)

Tumbled gray feldspar-rich stone, possibly granite or quartzite

Indeterminate; likely quartz–feldspar aggregate, potentially fine-grained granite or quartzite

Quartz with Iron Oxide Monzonite or Sandstone contact

Quartz (SiO2) with Limonite/Hematite staining

Feldspar-rich igneous rock, likely granite or gneiss fragment

Granite-like quartz–feldspar rock; exact identification is uncertain from the blurred image

Iron-rich weathered rock (likely limonite/goethite concretion)

Limonite–goethite mixture; chiefly FeO(OH)·nH₂O

Weathered gray metamorphic rock, likely phyllite or slate

Micaceous quartz–phyllosilicate rock; commonly quartz + muscovite/illite ± chlorite

Weathered quartz-rich rock, likely quartzite or altered sandstone

Quartzite (mostly microcrystalline quartz, SiO₂); exact identification is uncertain from the photograph

Fossilized Shark Tooth (Dermal Denticle or worn tooth fragment)

Elasmobranchii (fossil remains)

Rounded pebble, likely quartz-rich sandstone or chert

Indeterminate lithic clast; possibly quartz arenite or microcrystalline quartz (SiO₂)

Quartz (likely a weathered/tumbled piece)

Quartz (SiO₂)

Slate with Quartz Vein

Foliated Metamorphic Rock (Mainly Quartz, Muscovite, Chlorite)

Fossilized Shark Tooth

Carcharocles or Otodus sp. (Micro-fossilized)

Weathered quartz-rich rock, likely granite or granitic gneiss

Quartz–feldspar aggregate; probable granite (quartz + K-feldspar/plagioclase with minor mica), stained by iron oxides

Quartz Pebble

Silicon Dioxide (SiO2)

Jasper (likely Lake Superior Jasper)

Jasper (Silicon Dioxide, SiO2)

Porphyritic Basalt (Porphyry)

Porphyritic Basalt

Likely basaltic rock fragment

Fine-grained mafic igneous rock, probably basalt (plagioclase–pyroxene ± olivine)

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

Quartz (SiO2 - Silicon Dioxide)

Serpentinite (likely)

Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, or chrysotile)

Dark mafic igneous rock, likely basalt or gabbro

Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, possibly olivine and iron oxides

Quartz-rich metamorphic rock, possibly quartzite

Quartzite; primarily crystalline silicon dioxide (SiO₂), with minor feldspar, mica, or iron oxides

Rounded granitic pebble

Granite, likely biotite granite or granodiorite

Quartz cluster, possibly druzy quartz on matrix

Quartz (SiO₂), likely microcrystalline to coarse crystalline; associated matrix uncertain

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Weathered Gabbro or Diorite (Igneous Cobble)

Phaneritic Basic/Intermediate Igneous Rock

Granite Pebble

Granite (Felsic intrusive igneous rock)

River Cobble (Basaltic/Andesitic)

Mafic to Intermediate Volcanic Rock

Polished dendritic jasper or agate slab

Microcrystalline quartz (SiO₂), likely jasper with chalcedony and iron/manganese dendrites

Orange Calcite (Cleavage Rhomb)

Calcite (Calcium Carbonate, CaCO3)

Iron-rich breccia

Hematite–goethite-rich ferruginous breccia, likely a lateritic ironstone

Rounded brown pebble, likely weathered sandstone or iron-stained quartzite

Probable quartz-rich sandstone (SiO₂-dominated); exact identification requires testing

Shale / Mudstone

Laminated Mudrock (Siliciclastic Sedimentary Rock)

Shale (Beach-worn)

Laminated Pelite (primarily clay minerals and quartz)

Dark mafic igneous rock, likely basalt or gabbro

Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, possibly olivine