Mineral In A Matrix (Likely Quartz Or Feldspar)

Orbicular jasper (likely ocean jasper)

Silicified microcrystalline quartz/chalcedony with orbicular patterns; SiO₂

Quartz-rich rock fragment, possibly chalcedony or weathered quartz

Silicon dioxide (SiO₂), likely quartz/chalcedony

Greywacke with Quartz Veins

Lithic Sandstone (Greywacke) with SiO2 inclusions

Quartz Veined Basalt

Mafic Igneous Rock with Quartz (SiO2) intrusion

Porphyritic Rhyolite (Llanite or similar)

Porphyritic Rhyolite / Quartz-Feldspar Porphyry

Likely quartz cluster with iron staining

Quartz (SiO₂), possibly with calcite or feldspar inclusions

Quartz-rich conglomeratic sandstone

Lithic arkose/conglomerate, dominated by quartz and feldspar grains

Weathered porphyritic volcanic rock

Likely andesite or rhyolite porphyry, composed chiefly of feldspar and quartz with iron-oxide staining

Granite with Mafic Inclusions

Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)

Granite (likely weathered)

Granite, a quartz–feldspar–mica intrusive igneous rock

Quartz-rich pegmatite (likely quartz–feldspar–mica specimen)

Granitic pegmatite; chiefly quartz (SiO₂), feldspar, and mica

Rough amber-colored quartz or calcite fragment

Likely quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Porphyritic Basalt or Andesite

Porphyritic Basalt / Andesite

Basalt with Quartz Vein

Basalt (SiO2 vein inclusion)

Pegmatitic granite (likely feldspar–quartz–mica rock)

Coarse-grained granitic pegmatite; primarily quartz (SiO₂), feldspar, and mica, with possible epidote or chlorite

Banded gneiss pebble

Gneiss, a foliated metamorphic rock; exact mineral composition cannot be determined from the image

Olivine

Olivine group (Mg, Fe)2SiO4

Granite

Granite — a coarse-grained felsic intrusive igneous rock, typically composed of quartz, feldspar, and mica

Banded gneiss

Foliated quartz–feldspar gneiss, likely with mica

Sandstone

Arenite (primarily SiO2)

Raw fluorite-bearing rock, possibly fluorite in quartz/calcite matrix

Fluorite (CaF₂), with likely quartz (SiO₂) and/or calcite (CaCO₃) gangue

Possible sodalite-bearing rock

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, likely in a feldspathic matrix

Garden Quartz (Lodolite / Inclusion Quartz)

Quartz with inclusions (SiO2 with various mineral inclusions)

Graphic Granite

Graphic Granite (Granitic Pegmatite)

Green Spot Jasper (Kiwi Jasper / Sesame Jasper)

Partially altered granitic rock rich in quartz, microcline feldspar, and tourmaline or amphibole inclusions

Iron-stained quartz or quartz-rich fragment

Quartz (SiO₂), possibly with limonite/goethite staining

Ocean Jasper

Orbicular Jasper (varietal of SiO2 with impurities)

Granite (likely)

Granite, a coarse-grained intrusive felsic rock composed mainly of quartz, feldspar, and mica

Porphyritic basalt

Basalt with pink potassium-feldspar phenocrysts; likely alkaline or trachybasaltic composition

Porphyritic volcanic rock, likely andesite or rhyolite

Porphyritic andesite–rhyolite; chiefly plagioclase, quartz, and altered ferromagnesian minerals in a fine groundmass

Polished orbicular jasper (likely ocean jasper)

Silica-rich chalcedony/quartz aggregate with microcrystalline quartz, commonly containing feldspar and iron-oxide inclusions

Quartz-bearing pegmatitic rock, likely granite/pegmatite

Feldspar–quartz pegmatite; chiefly K-feldspar, plagioclase, quartz, and possible mica

Small quartz-rich rock fragment

Likely quartz (SiO₂), possibly a pale granite or feldspar-bearing fragment

Iron-stained quartz or quartz-rich rock

Quartz (SiO₂), possibly limonite/goethite-stained quartzite or breccia

Porphyritic basalt with quartz or feldspar phenocrysts

Basaltic rock; likely vesicular/porphyritic basalt, with pale mineral inclusions possibly quartz, feldspar, or calcite

Amygdaloidal Basalt

Amygdaloidal Basalt with Secondary Infilling (e.g., Agate, Quartz, or Zeolite)

Quartz-bearing feldspathic rock, possibly pegmatite

Granite/pegmatitic granitic rock; primarily quartz (SiO₂) and feldspar

Polymict conglomerate

Clastic conglomerate, likely polymictic pebble conglomerate

Milky quartz in weathered host rock

Quartz, silicon dioxide (SiO₂), likely with iron-stained feldspar or altered matrix

Weathered quartz-rich rock fragment

Likely quartz-bearing sandstone or granitic rock; exact identification is uncertain from the image

Basalt with Quartz/Calcite Inclusions

Mafic Volcanic Rock (Fe-Mg silicate rich)

Pegmatitic granite (quartz–feldspar–mica rock)

Granitic pegmatite; primarily quartz (SiO₂), alkali/plagioclase feldspar, and minor mica, with iron-oxide staining