Amygdaloidal Andesite Lava

Frothy Obsidian

Obsidian

Basalt Scoria

Red Granite

Rhyolite Lava

White Granite

Black Granite Gabbra

Dark Basalt Lava

Light Rhyolite Lava

Pumice ("The floating rock")

Granite

Vesicular Basalt

Arkose Sandstone

Coarse Arkose Sandstone

Conglomerate

Limestone

Limestone

Biochemical (Non-detrital)

Shell Fossil Limestone

Volcanic Tuff

Black Shale

Sandstone (This type of stone is abundant along the Red Cedar State Trail.)

Siltstone

Mudstone

Pink Quartz Sandstone

Fossil Non-detrital

Fossil Limestone

Sandstone

White Sandstone

Colored Quartzite

Greenschist Schist

Mica Schist

Morton Gneiss

Slate

Hornblende Gneiss

Kyanite Quartzite

Marble

Quartz Mica Schist

Calcite

Close-up of Calcite showing birefringence.  There is only one 'S' below the transparent mineral.

Elemental Copper

Gypsum

Halite

Magnetite

Pyrite (or Fool's Gold)

Fluorite

Galena (Wisconsin's State Mineral!)

Geode Quartz (Inside material is a quartz.)

Oolitic Hematite

Kaolinite

Muscovite

Strategic Minerals

Corundum

Garnet
Uses: Abrasive mineral, cutting and grinding tools

Alunite
Uses: Alloys, aircraft, tools, equipment

Bauxite 
(combination of minerals)
Uses: Alloys, beverage cans, tools

Cryolite
Uses: Alloys, tools, equipment

Stibnite
Uses: Alloys, infrared photography, rubber goods

Oripment
Uses: Poisons, pigments, wood preservatives

Arsenopyrite
Uses: Poisons, dyes, pyrotechnics, leather industry

Barite
Uses: Chemicals, explosives, paints

Beryl
Uses: Alloys, atomic energy, space vehicles

Chromite
Uses: Alloys, aircrafts, autos, metallurgy

Cobaltite
Uses: High temperature alloys, armor-piecing shells, paints

Columbite
Uses: Filaments, high-temperature alloys, tools

Azurite
Uses: Copper industry

Bornite
Uses: Copper industry

Chalcopyrite
Uses: Copper industry

Malachite
Uses: Alloys, ammunitions, brass, copper industry

Fluorite
Uses: Refrigerants, propellants, aluminum and steel industry

Graphite
Uses: Pencils, lubricants, pigments, paints

Hematite
Uses: Alloys, steel industry

Limonite
Uses: Alloys, steel industry

Magnetite
Uses: Alloys, steel industry

Siderite

Cerussite
Uses: Lead industry, alloys, batteries, x-ray equipment

Galena
Uses: Lead industry, alloys, ammunition, batteries, x-ray equipment 

Lepidolite
Uses: Atomic energy, batteries, welding/brazing

Magnesite
Uses: Alloys, aircraft, metallurgy, pyrotechnics

Psilomelane
Uses: Alloys, chemicals, metallurgy, antiseptics

Pryolusite
Uses: Alloys, ceramics, dyes, metallurgy

Cinnabar
Uses: Chemicals, mercury products

Biotite
Uses: Electrical insulators, roofing material, stove and furnace materials

Muscovite
Uses: Electrical insulators, fillers in paper, rubber and plastics

Molybdenite
Uses: Airplane, auto industry, steel alloys

Nickeline
Uses: Alloys, armor-plating, auto industry, ordnance

Sylvite
Uses: Chemical industry, fertilizers

Rock Crystal
(Quartz)
Uses: Optical instruments, abrasives, glass industry

Halite
Uses: De-icer for roads, cooking, bleaches, soap

Celestite
Uses: Heat treating metal, pyrotechnics, ceramics

Cassiterite
Uses: (Tin mineral), Alloys, bronze, canning 

Rutile
Uses: Pigment in paints, alloys, space vehicles

Scheelite
Uses: Steel alloys, chemical industry, dental products

Vanadinite
Uses: Steel alloys, auto and railway equipment

Carnotite
Uses: Atomic industry, military purposes

Uraninite
Uses: Atomic industry, military purposes

Sphalerite
Uses: (Zinc mineral), Alloys, brass, galvanized metal, pigments, paints