Metamorphic

Unidentified gray mineral/rock fragment

Indeterminate from image; possibly quartz-rich material or mica-bearing schist

Weathered quartz-rich rock fragment (possibly iron-stained quartzite)

Quartzite; primarily quartz (SiO₂), with iron-oxide staining and minor accessory minerals

Small quartz-rich pebble or rock fragment

Quartz (silicon dioxide, SiO₂), possibly with iron-oxide staining or host-rock inclusions

Muscovite mica

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Osumilite in Granite Matrix

(K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30

Ruby Fuchsite / Ruby in Fuchsite

Ruby (Al2O3 variety corundum) and Fuchsite (K(Al,Cr)2AlSi3O10(OH)2 - a chromium-rich variety of muscovite mica) in Quartz matrix

Garnet in Matrix

Almandine or Pyrope Garnet (X3Y2(SiO4)3) in Schist or Eclogite matrix

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, with minor mica and iron-oxide impurities

Kyanite

Kyanite, Al₂SiO₅

Quartzite

Metamorphic Quartzite (SiO2)

Slate

Foliated Metamorphic Rock

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Quartzite River Pebble

Metamorphic Quartzite (SiO2)

Quartzite River Rock

Metamorphic Quartzite (SiO2)

Foliated Gneiss

Gneiss (Metamorphic Rock)

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Yellow Quartzite Pitting Pebble

Metamorphic Quartzite (SiO2)

Banded Gneiss

Gneiss (Metamorphic Rock)

Banded Gneiss

Gneiss (Metamorphic Rock)

River Cobble (Quartzite or Chert)

Metamorphic Quarzite (SiO2)

Quartzite River Rock

Metamorphic Rock (Quartzite)

Slate

Foliated Metamorphic Rock

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Red Quartzite

Metamorphic Quartzite (SiO2)

Gneiss

Gneiss (Metamorphic Rock)

Banded Gneiss

Gneiss (Metamorphic Rock)

Quartzite with inclusions

Metamorphic Quartzite (SiO2)

Schist

Schist (Metamorphic Rock)

Quartzite

Metamorphic Quartzite (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Quartzite

Metamorphic Quartz Sandstone

Quartzite

Metamorphic Quartzite (SiO2)

Quartzite with Quartz Crystal Vug

Metamorphic Quartzite (SiO2)

Quartzite (River Cobble)

Metamorphic Quartzite (SiO2)

Gneiss

Metamorphic Foliated Gneiss

Quartzite Pebble (with mineral veining)

Metamorphic Quartzite (SiO2)

Quartzite with Quartz Veins

Metamorphic Quartzite (SiO2)

Quartzite pebble

Metamorphic Quartzite (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Slate

Slate (Metamorphic Rock)