Rocks and Minerals (O-Z)
Table Of Contents
Oligoclase
Realgar
Sulphates
Olivine
Red Ochre
Sulphides
Onyx
Replacement
Syenite
Opal
Resinous
Sylvanite
Orpiment
Rhodochrosite
Sylvite
Orthoclase
Rhodocrosite
Tachylite
Orthorhombic
Rhodonite
Tachylyte
Oxide
Rhyolite
Talc
Oxidized zone
Ruby
Tenacity
Pearly
Rutile
Tetragonal
Pectolite
Sanidine
Tetrahedrite
Pegmatite
Sapphire
Thenardite
Penninite
Scapolite
Till
Pentlandite
Scheelite
Tillite
Perlite
Schist
Topaz
Petalite
Schorl
Torbernite
Petroleum
Schwazite
Tourmaline
Phenakite
Scolecite
Trachyte
Phillipsite
Scorodite
Travertine
Phlogopite
Secondary minerals
Tremolite
Phosphates
Sepiolite
Triclinic
Pipe
Serpentine
Trydimite
Placer
Shale
Tufa
Plagioclase
Siderite
Tuff
Playa
Silica
Turquoise
Plutonic rock
Silicates
Twin
Polybasite
Silky
Ulexite
Polyhalite
Sillimanite
Umber
Potash
Silver
Uraninite
Potassium argon dating
Skutterudite
Vanadinite
Prase
Slate
Vein
Precipitation
Smithsonite
Vermilion
Prehnite
Sodalite
Vesicle
Proustite
Specific gravity
Vesuvianite
Pseudomorph
Sperrylite
Vitreous
Psilomelane
Sphalerite
Vivianite
Pumice
Sphene
Wavellite
Purpurite
Spinel
Willemite
Pyragyrite
Spodumene
Witherite
Pyrite
Staurolite
Woolastonite
Pyrolusite
Stephanite
Wulfenite
Pyromorphite
Stibnite
Ytterbite
Pyrope
Stilbite
Zincite
Pyrophyllite
Strata
Zircon
Pyroxenes
Streak
Zoisite
Pyrrhotite
Striations
Quartz
Strontianite