Mineral, Specifically A Rock Fragment

Arkosic Sandstone (or Conglomeritic Sandstone fragment)

Arkose (rich in feldspar)

Chalcedony Geode Fragment

Microcrystalline Quartz (SiO2)

Jasper Agate (specifically Brecciated Jasper)

Silicon Dioxide (SiO2) with iron oxide and clay impurities

Nuummite

Nuummite (ortho-amphibole rock)

White Topaz

Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Amethyst (Rough)

Silicon Dioxide with iron impurities (SiO2)

Druzy Quartz (on Geode Fragment)

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Fossilized Angel Wing Shell

Cyrtopleura costata

Quartz (Milky Quartz vein fragment)

Silicon Dioxide (SiO2)

Concretion

Various mineral compositions, typically carbonate or iron oxide cemented sediment

Man-made Jewelry (Metal and Glass/Plastic)

Synthetic Alloy and Amorphous Solid (SiO2/Polymer)

Amygdaloidal Basalt with Epidote/Chlorite

Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))

Quartz Druzy on Geode Fragment

Silicon Dioxide (SiO2)

Sedimentary Breccia

Clastic Breccia (CaCO3/SiO2 matrix)

Sandstone (likely Fossiliferous)

Arenite / Sedimentum arenaceum

Feldspar (specifically Orthoclase)

Potassium Aluminum Silicate (KAlSi3O8)

Chert (Jasper variety) with Iron Oxide staining

Cryptocrystalline Quartz (SiO2) with Goethite/Limonite impurities

Oolite (Ooids)

Oolitic Limestone (Principal mineral: Calcite, CaCO3)

River Rock / Stream Pebble

Fluvial Clast / Rounded Sedimentary Particle

Jasper (specifically Red or Brecciated Jasper variant)

Jasper (Microcrystalline Quartz - SiO2)

Foliated Metamorphic Rock (likely Gneiss or Schist)

Gneissic Metamorphic Rock

Greywacke (likely)

Greywacke (a type of sandstone)

Gneiss (specifically Banded Gneiss)

Gneiss

Quartz Druzy Geode Fragment

Silicon Dioxide (SiO2)

Chert (specifically Flint or Gray Chalcedony)

Microcrystalline Quartz (SiO2)

Conglomerate

Conglomerate (SiO2 matrix with various silicate clasts)

Smoky Quartz on Feldspar (Granite Pegmatite)

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)

Quartz Veined Rock (Likely Graywacke or Quartzite)

Silicon Dioxide (SiO2) veins in Metasedimentary matrix

Breccia

Breccia

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (Pebble/Conglomerate fragment)

Sandstone (clastic sedimentary rock)

Sandstone

Arenite (SiO2 dominant)

Agate Geode

Banded Chalcedony (Silicon Dioxide, SiO2) with Quartz crystals

Breccia

Clastic Breccia (General mineral composition depends on fragments, often SiO2 or CaCO3)

Rock Crystal Quartz

Quartz (SiO₂)

Quartz Crystal

Silicon Dioxide (SiO2)

Unknown Organic Object (likely a berry or fruit)

Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.

Oolitic Limestone

Oolite (Sedimentary rock composed of CaCO3)

Sandstone

Arenite (SiO2 predominantly)