Rock Identifier

Category

The Purple Specimen Is A Mineral (Amethyst); The White Specimen Is A Sedimentary Rock (Limestone Or Marble).

Browse the purple specimen is a mineral (amethyst); the white specimen is a sedimentary rock (limestone or marble). specimens identified by the Rock Identifier community.

Learn about The Purple Specimen Is A Mineral (Amethyst); The White Specimen Is A Sedimentary Rock (Limestone Or Marble). in the encyclopedia

Emerald in Matrix

Emerald in Matrix

Aquamarine Matrix

Aquamarine Matrix

Parian Marble

Marl

White Obsidian

Chalk

Ilmenite

Kimberlite

Acanthite

Crocoite

Limonite

Harzburgite

Amethyst and Limestone (Amethyst (SiO2 - Silicon Dioxide) and Limestone (CaCO3 - Calcium Carbonate)) — The purple specimen is a mineral (Amethyst); the white specimen is a sedimentary rock (Limestone or Marble).

Amethyst and Limestone

Amethyst (SiO2 - Silicon Dioxide) and Limestone (CaCO3 - Calcium Carbonate)

The purple specimen is a mineral (Amethyst); the white specimen is a sedimentary rock (Limestone or Marble).

Amethyst Geode (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst Geode

Silicon Dioxide (SiO2) with iron impurities

Calcite on Matrix (Calcium Carbonate (CaCO3)) — mineral

Calcite on Matrix

Calcium Carbonate (CaCO3)

Marble (Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)) — metamorphic

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Amethyst and Agate Geode Section (Silicon Dioxide (SiO2) - Crystalline Quartz and Chalcedony) — mineral

Amethyst and Agate Geode Section

Silicon Dioxide (SiO2) - Crystalline Quartz and Chalcedony

Marble (Recrystallized Carbonate Rock (CaCO3)) — metamorphic

Marble

Recrystallized Carbonate Rock (CaCO3)

Marble (Carrara style) (Recrystallized Calcite-rich Metamorphic Rock (CaCO3)) — metamorphic

Marble (Carrara style)

Recrystallized Calcite-rich Metamorphic Rock (CaCO3)

Druzy Quartz Geode (with Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Druzy Quartz Geode (with Chalcedony)

Silicon Dioxide (SiO2)

Marble (Metamorphosed Limestone (calcite formulation CaCO3)) — metamorphic

Marble

Metamorphosed Limestone (calcite formulation CaCO3)

Marble (Recrystallized Calcite Rock (CaCO3)) — metamorphic

Marble

Recrystallized Calcite Rock (CaCO3)

Quartz Geode (partially formed) (Silicon Dioxide (SiO2)) — mineral

Quartz Geode (partially formed)

Silicon Dioxide (SiO2)

White Marble (Recrystallized Calcite (CaCO3)) — metamorphic

White Marble

Recrystallized Calcite (CaCO3)

Quartz on Matrix (Silicon Dioxide (SiO2)) — mineral

Quartz on Matrix

Silicon Dioxide (SiO2)

Mixed rock and mineral specimen collection (Multiple species, likely quartz (SiO₂), calcite (CaCO₃), feldspar, chert, and assorted volcanic/sedimentary rocks) — mineral

Mixed rock and mineral specimen collection

Multiple species, likely quartz (SiO₂), calcite (CaCO₃), feldspar, chert, and assorted volcanic/sedimentary rocks

Amethyst Geode (Silicon Dioxide with trace inclusions of Iron (SiO2)) — mineral

Amethyst Geode

Silicon Dioxide with trace inclusions of Iron (SiO2)

Amethyst (Chevron Amethyst) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst (Chevron Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Chevron Amethyst (Silicon Dioxide with Iron Impurities (SiO2)) — mineral

Chevron Amethyst

Silicon Dioxide with Iron Impurities (SiO2)

Amethyst (Amethyst (Silicon Dioxide - SiO2 with iron impurities)) — mineral

Amethyst

Amethyst (Silicon Dioxide - SiO2 with iron impurities)

Geode with Quartz and Chalcedony (Silicon Dioxide (SiO2)) — sedimentary

Geode with Quartz and Chalcedony

Silicon Dioxide (SiO2)

Calcite (Calcium Carbonate (CaCO3)) — mineral

Calcite

Calcium Carbonate (CaCO3)

Chevron Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Chevron Amethyst

Silicon Dioxide (SiO2) with iron impurities

Quartz Geodes and Crystal Clusters (Silicon Dioxide (SiO2)) — mineral

Quartz Geodes and Crystal Clusters

Silicon Dioxide (SiO2)

Amethyst geode/druse (Quartz, SiO₂; purple variety amethyst) — mineral

Amethyst geode/druse

Quartz, SiO₂; purple variety amethyst

Optical Calcite (Calcium Carbonate (CaCO3)) — mineral

Optical Calcite

Calcium Carbonate (CaCO3)

Clear Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Amethyst Geode Fragment (Amethyst (Silicon Dioxide, SiO2) with Quartz matrix) — mineral

Amethyst Geode Fragment

Amethyst (Silicon Dioxide, SiO2) with Quartz matrix

Clear Calcite (Calcite (Calcium Carbonate, CaCO3)) — mineral

Clear Calcite

Calcite (Calcium Carbonate, CaCO3)

Dyed Quartz Geode (Silicon Dioxide (SiO2) with artificial purple dye) — mineral

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial purple dye

Amethyst (Silicon Dioxide (SiO2) with iron impurities) — gemstone

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Geode (unopened) or Calcareous Nodule (Siliceous or Calcareous Concretion/Nodule) — sedimentary

Geode (unopened) or Calcareous Nodule

Siliceous or Calcareous Concretion/Nodule

Amethyst cluster (Quartz, SiO₂ (purple variety: amethyst)) — mineral

Amethyst cluster

Quartz, SiO₂ (purple variety: amethyst)

Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Chevron Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Chevron Amethyst

Silicon Dioxide (SiO2) with iron impurities

Amethyst (Chevron Amethyst) (Amethystine Quartz (SiO2)) — mineral

Amethyst (Chevron Amethyst)

Amethystine Quartz (SiO2)

Yellow Calcite (Calcite (Calcium Carbonate, CaCO3)) — mineral

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Amethyst-bearing quartz cluster (Quartz, SiO₂; purple coloration commonly from iron-related defects and irradiation) — mineral

Amethyst-bearing quartz cluster

Quartz, SiO₂; purple coloration commonly from iron-related defects and irradiation

Druzy Quartz on Agate/Chert (Silicon Dioxide (SiO2)) — mineral

Druzy Quartz on Agate/Chert

Silicon Dioxide (SiO2)

Amethyst (Amethyst (Silicon Dioxide - SiO2 with impurities of iron)) — mineral

Amethyst

Amethyst (Silicon Dioxide - SiO2 with impurities of iron)

Calcite (Optical or Clear Calcite) (Calcium Carbonate (CaCO3)) — mineral

Calcite (Optical or Clear Calcite)

Calcium Carbonate (CaCO3)

Mixed rock and mineral collection (Multiple specimens; visible examples may include quartz (SiO₂), amethyst (quartz), calcite (CaCO₃), and dark mafic rocks) — mineral

Mixed rock and mineral collection

Multiple specimens; visible examples may include quartz (SiO₂), amethyst (quartz), calcite (CaCO₃), and dark mafic rocks

White Marble (Recrystallized Calcite (CaCO3)) — metamorphic

White Marble

Recrystallized Calcite (CaCO3)