Marble

Limestone

Calcium Carbonate (CaCO3)

Chert

Chert (Microcrystalline Quartz, SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline quartz (SiO2)

Chert (and Flint)

Microcrystalline Silica (SiO2)

Chert (Cherty Limestone / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Yellow Jasper/Quartzite Pebble)

Microcrystalline Silicon Dioxide (SiO2)

Rough Diamond

Native Carbon (C)

Asphalt (Bituminous Slate/Sandstone)

Asphaltum / Bituminous Rock

Basalt (Polished pebble)

Basalt (Aphanitic mafic volcanic rock)

Diamond (specifically Blue Diamond color appearance)

Carbon (C) with trace Boron

Fossilized Shark Tooth

Carcharhinus sp. (likely Bull or Requiem shark family)

Serpentinite (River Pebble)

Serpentinite (complex of Antigorite, Lizardite, and Chrysotile: Mg3Si2O5(OH)4)

Chert

Chert (Microcrystalline Quartz, SiO2)

Fossil Sand Dollar (Echinoidea)

Phylum Echinodermata, Class Echinoidea (likely Dendraster or Scutella)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Fossilized Shark Tooth

Fossil Chondrichthyes (various genera such as Carcharias or Odontaspis)

Belemnite (Fossilized Rostrum)

Belemnitida (order), specifically Neohibolites or similar genera depending on age

Chert (Yellow/Tan variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (White Variety)

Microcrystalline Quartz (SiO2)

Chert (and/or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Diamond in Kimberlite

Kimberlite host rock with C (Carbon) inclusion

Chert (specifically a Chert Nodule or Flint)

Cryptocrystalline Quartz (SiO2)

Quartz (Water-worn Pebble)

Silicon Dioxide (SiO2)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Honeycomb Coral Fossil

Favosites (extinct genus of tabulate coral)

Coquina

Biogenic Limestone (Calcite/Aragonite base, CaCO3)

Sandstone (Quartzose Pebble)

Arenite (composed primarily of SiO2)

Diamond (as featured in jewelry)

Diamond (C - pure carbon)

Limestone with Iron Inclusions

Calcium Carbonate (CaCO3) with Hematite/Limonite

Fossiliferous Limestone (Crinoid stem)

CaCO3 (Calcium Carbonate) with Fossil Inclusions

Industrial Diamond (Bort or Boart)

Diamond (pure Carbon, C)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Jasper

Silicon Dioxide (SiO2)

Aragonite

Aragonite (Calcium Carbonate - CaCO3)

Sandstone (with Manganese staining)

Arenite (composed primarily of SiO2)

Banded Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (Jasper)

Microcrystalline Quartz (SiO2) with iron oxide impurities

Chert (Green variety)

Chert (Silicon Dioxide, SiO2)

Chert (River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Banded Iron Formation (Jaspillite)

Banded Iron Formation (BIF) / Jaspillite

Diamond

Carbon (C)

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O