Sedimentary Rock Or Mineral (Depending On Origin And Purity)

Milky Quartz (Crystal Cluster)

Silicon Dioxide (SiO2) - Quartz Variety

Dzi Bead (Etched Chalcedony)

Cryptocrystalline Quartz (SiO2) with chemical etching

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.

Diamond (as set in a metal alloy ring)

Diamond (Pure Carbon, C)

Diamond (Green tinted)

Carbon (C) with trace impurities or lattice defects

Note: Item is not a geological specimen

Homo sapiens (Dermal Appendage: Pilus)

White Quartz

Silicon Dioxide (SiO2)

Pebble

Clast (specifically a granule or small pebble)

Larimar and Fossil Coral

Pectolite (NaCa2Si3O8(OH)) and Hexagonaria/Petoskey Stone

Quartzite

Quartzite (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Sedimentary Breccia

Clastic Breccia (CaCO3/SiO2 matrix)

Ruby

Corundum (Al2O3 with Chromium traces)

Placer Gold Nugget

Native Gold (Au)

Not a rock, mineral, or geological specimen

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Cullet Glass (Man-made Glass Slag)

Amorphous Silica (SiO2) with chemical additives

Fluorite (Rainbow Fluorite)

Calcium Fluoride (CaF2)

Massive Quartz (Milky or Gray)

Silicon Dioxide (SiO2)

Diorite (possibly fine-grained variety or a related intermediate intrusive rock like a felsic gabbro or a dark granodiorite)

Diorite (Igneous rock, intrusive, intermediate composition)

Rose Quartz

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

Sandstone Pebble (Quartzite-rich)

Clastic Terrigenous Sedimentary Rock (SiO2 dominant)

Milky Quartz Geode with Chlorite

Silicon Dioxide (SiO2) with Chlorite group inclusions

Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (primarily SiO2)

Diamond

Diamond (pure Carbon, C)

Chert (Chert Nodule with Chalky Cortex)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Yellow Calcite

Calcium Carbonate (CaCO3)

Jasper (Mookaite style)

Jasper (Silica-rich Microcrystalline Quartz, SiO2)

Piddock-bored Mudstone

Lutite (Siltstone or Mudstone) with Pholad borings

Blue Sapphire

Corundum (Al2O3 with trace Titanium and Iron)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Sandstone

Sandstone (clastic sedimentary rock)

Chalk

Calcium Carbonate (CaCO3)

Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)

Chert (microcrystalline quartz)

Basalt (River Rock/Cobble)

Basalt (no specific mineral formula as it's a rock)

Pearl (incorporated into jewelry)

Aragonite and Calcite (CaCO3)

Diamond

C (Carbon)

Rose Quartz

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

Marble

Marbles are primarily composed of calcite (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).

Emerald

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Black Jasper

Black Jasper (Silicate mineral - SiO2)

Fossilized Dinosaur Skull (Tyrannosaurus rex)

Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica