Mineralogical

Dragon Blood Jasper

Microcrystalline Quartz (Chalcedony) with Epidote and Piemontite

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions

Granite

Intrusive Igneous Rock

Granite

Intrusive igneous rock

Granite

Intrusive Igneous Rock

Eclogite

Eclogite (Omphacite-Garnet rock)

Amphibolite

Amphibolite (rich in amphibole and plagioclase feldspar)

Quartzite

Quartzite (SiO2)

Granite

Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Granite

Granite (Felsic intrusive igneous rock)

Gneiss

High-grade Metamorphic Gneiss

Gossan with Copper Carbonate (Chrysocolla/Malachite)

Ferruginous Oxide (Gossan) with Cu2CO3(OH)2 (Malachite) or (Cu,Al)2H2Si2O5(OH)4 (Chrysocolla)

Weathered iron-rich rock (probable laterite or limonite-bearing stone)

Goethite–limonite mixture, commonly written FeO(OH)·nH₂O, with possible quartz and clay minerals

Banded Calcite (Mexican Onyx)

Calcium Carbonate (CaCO3)

Limonite (Ironstone Concretion)

Limonite (Hydrous Ferric Oxides mixed with Goethite)

Pink Granite

Phaneritic Felsic Igneous Rock

Limonite with Quartz

FeO(OH)·nH2O (Limonite) with SiO2 (Quartz)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Granite

Granite (Felsic Plutonic Rock)

Tumbled azurite–malachite or blue jasper (tentative)

Likely azurite-bearing copper mineral aggregate; composition commonly Cu₃(CO₃)₂(OH)₂ with associated malachite Cu₂CO₃(OH)₂

Tumbled gray stone, likely serpentinite or weathered basalt

Tentatively serpentinite (predominantly serpentine-group minerals); identification is uncertain from the photograph

Banded Gneiss (with Quartz Vein)

Gneiss (Metamorphic rock of varying mineralogy)

Gabbro

Gabbro (composed mainly of calcium-rich plagioclase feldspar and pyroxene)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Optical Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Weathered iron-rich sandstone or ironstone cobble

Ferruginous sandstone/ironstone, chiefly quartz (SiO₂) cemented or stained by iron oxides and hydroxides

Dark mafic rock, likely basalt

Basalt; primarily plagioclase feldspar and pyroxene, commonly with olivine and iron oxides

Crushed Stone (Gravel/Aggregates)

Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)

Granite

Granite (Phaneritic igneous rock)

Granite

Phaneritic Igneous Rock (composed primarily of Quartz SiO2, Alkali Feldspar, and Plagioclase)

Jasper and Greenstone Pebble

Siliceous rock / Metamorphic pebble

Red Granite

Phaneritic Felsic Intrusive Igneous Rock (primarily K-feldspar, Quartz, and Biotite)

Red Granite

Phaneritic Plutonic Rock (High Potassium Feldspar)

Serpentinized ultramafic rock with magnesite

Serpentinite, chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with likely magnesite (MgCO₃) and minor chromite/magnetite

Quartzite

Quartzite (primarily SiO2)

Probable weathered basalt or andesite

Fine-grained mafic to intermediate volcanic rock; commonly plagioclase ± pyroxene, amphibole, and iron oxides

Granite

Felsic intrusive igneous rock

Weathered porphyritic volcanic rock

Likely andesite or dacite, with feldspar phenocrysts in a fine-grained groundmass

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2 with minor Fe2O3)

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Charoite

Charoite (K(Ca,Na)2Si4O10(OH,F)·nH2O)

Hypersthene

Enstatite (Hypersthene variety), (Mg,Fe)SiO3