Single Minerals

These are minerals Mr. Alexander has only one example of that don't need a dedicated page.

Cerussite is a lead carbonate. It is an important ore and common secondary mineral of lead.

Colors It Comes In - Colorless, White, Gray, pale Yellow, Blue, or Green

Fracture - Conchoidal

Shape - Prismatic or Tabular habit, with elongated or flattened crystals

Luster - Adamantine, Vitreous, Resinous, Submetallic, Pearly

Texture - Glass like to waxy

Streak - White

Locality - Germany, the Czech Republic, Slovenia, Scotland, England, France, Italy, Russia, Tunisia, Morocco, Namibia, Iran, Australia, and the United States.

Where It Can Be Found - In oxidized lead deposits where it can, on occasion, be an important ore.

Hardness On The Mohs Scale - 3 To 3.5 Out Of 10

Cerussite

Pumice is formed when lava and water mix together. Pumice is a volcanic rock that consists of highly vesicular rough-textured volcanic glass, which may or may not contain crystals.

Colors It Comes In - White, Yellowish, light to dark Gray, Blue, Green-Brown, or Black, depending on the type of lava from which it forms. Pumices from silica-rich lavas are White, those from lavas with intermediate silica content are often Yellow or Brown, and rarer silica-poor that are Black.

Luster - Earthy

Texture - Vesicular

Streak - White, Greenish White or Grey

Locality - Spain

Where It Can Be Found - Afghanistan, Indonesia, Japan, Russia, Ethiopia, Kenya, Tanzania, Greece, Hungary, Iceland, Italy, Turkey, Bahamas, Barbados, Canada, Costa Rica, Cuba, Jamaica, Mexico, USA, Argentina, Chile, Ecuador, Peru, New Zealand, Western Australia

Hardness On The Mohs Scale - 6 Out Of 10

Pumice

Purpurite

Purpurite is a manganese phosphate mineral with varying amounts of iron depending upon its source.

Colors It Comes In - brownish black, purple, and violet to dark red

Fracture Pattern - Uneven/Irregular

Luster - Earthy, Shiny

Texture - Granular, Chalky

Streak - Purple

Locality - Namibia, South Africa

Where It Can Be Found - North Carolina, South Dakota, California, France, Rwanda, Australia, Portugal, Maine

Hardness On The Mohs Scale - 4 To 4.5 Out Of 10

Hornblende

Hornblende is a complex inosilicate series of minerals. The name is used as a general or field term to refer to dark amphibole. Hornblende minerals are common in igneous and metamorphic rocks.

Colors It Comes In - Black to dark Green or Brown

Fracture - Subconchoidal and Uneven

Shape - Hexagonal, Granular

Luster - Vitreous to Dull

Texture - Irregular grains or fibrous masses

Streak - Pale Gray, Gray-White

Locality - United States, Canada, Norway, and Italy

Where It Can Be Found - It is found in many intrusive igneous rocks ranging in composition from granites to diorite to gabbros to syenites. It occurs as phenocrysts in several varieties of extrusive igneous rocks, such an andesite.

Hardness On The Mohs Scale - 5 To 6 Out Of 10

Manganese Dendrite Crystal

Dendrites are a type of mineral. They form when manganese or iron oxides crystallize in branching patterns on the surface of or inside of rocks. These patterns can mimic the appearance of plants or trees, leading to the common misconception that they are fossils.

Colors It Comes In - White, Gray, or Black

Shape - Tree like

Luster - Vitreous, Dull, Waxy

Streak - Brownish-black

Locality - The World

Where It Can Be Found - In Agates and Limestone