Marble (White)
Metamorphosed Limestone (mainly CaCO3)
metamorphic
Category
Organic (Paper And Cellulose)
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Chalk
Calcium Carbonate (CaCO3)
sedimentary
Slate
Slate (Metamorphic Rock)
metamorphic
Graphite-bearing quartz-mica schist
Graphite-rich quartz–mica schist; primarily quartz (SiO₂), muscovite/biotite, and graphite (C)
metamorphic
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
metamorphic
Marble
Recrystallized Calcite Rock (CaCO3)
metamorphic
Chalk (Limestone variant)
Calcium Carbonate (CaCO3)
sedimentary
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
White Marble (Industrial/Architectural)
Recrystallized Calcite (CaCO3)
metamorphic
Probable amber fragment
Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)
gemstone
Selenite
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Selenite
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Chalk (Sedimentary Limestone)
Calcium Carbonate (CaCO3) - Bioclastic Limestone
sedimentary
Crushed Limestone
Calcium Carbonate (CaCO3)
sedimentary
Barite
Barium Sulfate (BaSO4)
mineral
Barite
Barium Sulfate (BaSO4)
mineral
Baryte (Barite)
Barium sulfate (BaSO4)
mineral
White Marble
Calcite-rich Metasomatized Carbonate (CaCO3)
metamorphic
Chalk / Sedimentary Limestone
Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock
sedimentary
Likely graphite-rich schist (graphitic schist)
Graphitic schist; chiefly quartz, mica, and graphite (carbon), with possible pyrite or feldspar
metamorphic
Yellow calcite (tumbled honey or lemon calcite)
Calcite, calcium carbonate (CaCO₃), likely a yellow/orange calcite variety
mineral
Calcite
Calcite (CaCO₃)
Mineral
Calcite
Calcite (CaCO 3)
Mineral
Calcite
Calcite (Mineral; CaCO₃)
Mineral
Crushed Limestone
Limestone (CaCO3)
sedimentary
Fossil Coral
Cnidaria Anthozoa (Fossilized)
sedimentary
Fossilized Coral (Petoskey Stone or Rugose Coral)
Antophyllum (Hexagonaria) or Scleractinia (CaCO3)
sedimentary
Purple Agate (Dyed Chalcedony)
SiO2 (Silicon Dioxide) with organic dyes
mineral
Petrified Wood
Silicified Wood (SiO2 / Quartz pseudomorph after wood)
fossil
Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized Coral (Petoskey Stone / Favosites)
Hexagonaria percarinata / Favosites sp. (Calcite, CaCO3)
fossil
Septarian Nodule (Micro-fragment)
Septarian Nodule / Concretion (CaCO3 + CaMg(CO3)2 + Quartz)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Dendritic Limestone
Calcite with Manganese Oxide (Manganese Dendrites)
sedimentary
Zebra Rock / Zebra Marble
Banded Limestone-Marble Transition
metamorphic