Mineral In A Matrix (Likely Quartz Or Feldspar)

Quartz–feldspar pegmatite with iron-oxide staining

Granitic pegmatite; predominantly SiO₂ quartz with K-feldspar/plagioclase and likely Fe-oxide minerals

Quartz–feldspar pegmatite specimen

Granitic pegmatite, chiefly quartz (SiO₂), potassium feldspar (KAlSi₃O₈), and mica-group minerals

Porphyritic Rhyolite or Andesite (Porphyry)

Porphyritic igneous rock (Composition depends on exact mineralogy, often Rhyolite or Andesite)

Dyed druzy quartz pendant

Quartz, SiO₂; likely a dyed druzy quartz cluster

Blue-and-yellow sodalite-bearing rock (likely sodalite in nepheline syenite)

Sodalite, Na8(Al6Si6O24)Cl2, likely mixed with feldspar and/or nepheline

Granite countertop slab

Granite; primarily quartz, feldspar, and mica

Conglomeratic aggregate / pebble-rich concrete-like rock

Polymictic conglomerate (likely glacial or beach-derived gravel matrix); exact identification uncertain from image

Porphyry

Porphyritic Igneous Rock

Quartz Vein in Matrix

Silicon Dioxide (SiO2) within Rhyolitic or Granitic Matrix

Black obsidian with rhyolitic inclusions

Obsidian, volcanic glass; predominantly silica-rich rhyolitic composition (approximately 70–75% SiO₂)

Weathered porphyritic volcanic rock, likely andesite

Porphyritic andesite (tentative; plagioclase ± pyroxene/amphibole in a fine groundmass)

Orbicular jasper (ocean jasper)

Silicified volcanic rock, chiefly microcrystalline quartz/chalcedony with feldspar, zeolites, and iron-oxide-rich orbicules

Conglomeratic breccia (possibly polymictic volcanic breccia)

Polymictic breccia; clasts in a fine-grained volcanic or sedimentary matrix

Quartz-rich pegmatitic rock, probably granitic gneiss

Quartz–feldspar–mica gneiss; locally pegmatitic granite

Sandstone with Quartz Vein

Arenite with Quartz (SiO2) protrusion

Blue-gray metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica assemblage; exact identification requires testing

Sandstone (Ferruginous)

Clastic Sedimentary Rock (Sandstone)

Porphyritic granite

Coarse-grained felsic intrusive igneous rock, chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende

Weathered sandstone or siltstone exposure

Quartz–feldspar clastic sedimentary rock; exact lithology indeterminate from the image

Pink feldspar-bearing pegmatite

Orthoclase–microcline feldspar, chiefly KAlSi₃O₈, in a granitic pegmatite matrix

Crushed Granite and Quartz Gravel

Composite Igneous and Silicate Rock Aggregate

Garnet-bearing metamorphic rock

Garnet schist or garnet amphibolite; garnet likely almandine–pyrope solid solution, (Fe,Mg)₃Al₂Si₃O₁₂

Mixed rounded gravel and weathered rock fragments

Polymictic alluvial or glacial gravel; composition appears to include basaltic, quartz-rich, and feldspathic clasts

Dalmatian Jasper

Dalmatian Stone (Arfvedsonite/Albite Microquartz)

Quartz-rich pegmatite fragment

Granite/pegmatite; chiefly quartz (SiO₂) and feldspar, with possible biotite or tourmaline

Dalmatian Jasper

Dalmatian Stone (a microcrystalline quartz and feldspar rock with arfvedsonite)

Quartz-rich pegmatite (likely tourmaline-bearing)

Granitic pegmatite; primarily quartz (SiO₂), with feldspar and dark tourmaline/biotite

Quartz-rich pegmatite (likely feldspar–quartz rock)

Granitic pegmatite; chiefly quartz (SiO₂) and feldspar, with possible mica/iron-oxide staining

Green glassy mineral specimen, likely rough emerald or green fluorite

Tentatively beryl (Be₃Al₂Si₆O₁₈), emerald variety; synthetic/man-made glass cannot be excluded from the photograph

Quartz-rich pegmatite with mica

Granitic pegmatite; mainly quartz (SiO₂), feldspar, and muscovite/biotite mica, with possible sulfide or iron-oxide staining

Basalt with a light-colored mineral vein or alteration patch

Fine-grained basalt, likely containing plagioclase and/or calcite–zeolite infill

Quartz-rich pegmatite (weathered feldspar–quartz rock)

Granitic pegmatite; primarily quartz (SiO₂), feldspar, and minor biotite/iron-oxide minerals

Olivine in Quartz/Feldspar Matrix (Peridotite or Granitic Pegmatite)

(Mg,Fe)2SiO4 (Olivine) with Quartz / Feldspar

Weathered, feldspar-rich granite (tentative)

Granite; chiefly quartz and feldspar, with possible dark mica or amphibole

Orbicular granite (likely larvikite or related granitic rock)

Granite composed mainly of quartz, feldspar, and dark mafic minerals; exact variety is uncertain from the image

Quartz-rich pegmatite (likely mica-bearing granite)

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

Porphyritic Basalt

Basalt (with plagioclase or k-feldspar phenocrysts)

Weathered granitic gneiss

Foliated quartz–feldspar–mica gneiss, likely with biotite and amphibole

Garnet-bearing metamorphic rock

Garnet amphibolite or garnet schist; almandine garnet (Fe₃Al₂Si₃O₁₂) likely

Quartz–feldspar pegmatite mineral specimen

Quartz (SiO₂) with potassium feldspar, albite, mica, and likely garnet or tourmaline

Porphyritic Granite pebble (or Porphyry)

Porphyritic Plutonic Igneous Rock (Granite / Monzonite porphyry)

Dalmatian Stone (Dalmatian Jasper)

Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite