Organic Materia (Not A Rock Or Mineral)

Green Apophyllite and Stilbite on Quartz Cluster

Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Quartzite with Hematite staining

Quartzite (SiO2) with iron oxide inclusions

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Granite

Granite (Felsic Plutonic Rock)

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.

Druzy Quartz Geode (Oco or Moroccan variety)

Silicon Dioxide (SiO2)

Sandstone with Quartz Veins

Arenite (primarily SiO2 with Fe2O3 staining)

Petrified Wood

Silicified Wood (SiO2)

Fossil Coral (Favosites Honeycomb)

Favosites (Genus), Phylum Cnidaria, Class Anthozoa

Petrified Wood

Silicified Wood (SiO2)

Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Fossiliferous Chert (with Fossil Shells)

Silicon Dioxide (SiO2) with biogenic inclusions

Breciated Limestone with Calcite Veins

Sedimentary Breccia (CaCO3)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Volcanic Rock)

Chrysocolla and Azurite in Matrix

Hydrated copper phyllosilicate (Chrysocolla - Cu2H2Si2O5(OH)4) and Copper carbonate (Azurite - Cu3(CO3)2(OH)2)

Quartz on Basalt

Silicon Dioxide (SiO2) on Mafic Igneous Rock

Tiger's Eye (Mineral Collection)

Tiger's Eye (SiO2 with crocidolite inclusions)

Chert (variations include Flint/Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (and Limestone)

Chert (consisting of Microcrystalline Quartz, SiO2)

Boxwork Siderite or Sepatarian Nodule Weathering

Siderite (FeCO3) with secondary mineralization or Boxwork Geode fragment

Brachiopod Fossil (Spiriferid)

Phylum Brachiopoda, Order Spiriferida (CaCO3 - Calcium Carbonate)

Chert (Flint)

Chert (Microcrystalline or cryptocrystalline Quartz, SiO2)

Asphalt (Road Aggregate)

Asphalt concrete / Bituminous mixture

Sandstone

Arenite (composed primarily of SiO2)

Massive Quartz with Host Rock

Silicon Dioxide (SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert (variant Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Dendritic Jasper

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Petrified Wood

Silicified Wood (SiO2)

Knightia Fossil in Limestone

Knightia eocaena in micritic limestone

Quartz Vein in Pelite (Metamorphic Rock)

Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)

Yellow Jasper (Mookaite style)

Silicon Dioxide (SiO2) with Goethite/Hematite inclusions

Chert (with Lichen)

Microcrystalline Quartz (SiO2)

Chert (specifically Banded Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Ferruginous Sandstone (Ironstone)

Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)

Granite (Specimen: Logan Rock)

Phaneritic plutonic igneous rock (mainly Quartz, Feldspar, and Mica)

Concretion

Various mineral compositions, typically carbonate or iron oxide cemented sediment

Banded Gneiss

Gneiss (Metamorphic Rock)

Bauxite / Iron-rich Laterite

Laterite (principally Al(OH)3, Fe2O3, and SiO2)

Petrified Wood

Silicified Wood (SiO2)