Definition
Origin
Discoverer
Etymology
Class
Sub-Class
Group
Other Categories
Texture
Color
Maintenance
Durability
Water Resistant
Scratch Resistant
Stain Resistant
Wind Resistant
Acid Resistant
Appearance
Interior Uses
Exterior Uses
Other Architectural Uses
Construction Industry
Medical Industry
Antiquity Uses
Commercial Uses
Types
Features
Monuments
Famous Monuments
Sculpture
Famous Sculptures
Pictographs
Petroglyphs
Figurines
Fossils
Formation
Mineral Content
Compound Content
Metamorphism
Types of Metamorphism
Weathering
Types of Weathering
Erosion
Types of Erosion
Hardness
Grain Size
Fracture
Streak
Porosity
Luster
Compressive Strength
Cleavage
Toughness
Specific Gravity
Transparency
Density
Specific Heat Capacity
Resistance
Asia
Africa
Europe
Others
North America
South America
Australia
Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly with minimum crystal growth
From Latin obsidianus, misprint of Obsianus (lapis) (stone) of Obsius
Durable Rock, Medium Hardness Rock
Black, Blue, Brown, Green, Orange, Red, Tan, Yellow
Decorative Aggregates, Interior Decoration
Arrowheads, Cutting Tool, Knives, Scrapers, Spear Points
Creating Artwork, Mirror, Used in aquariums
Fireworks Obsidian, Mahogany, Sheen Obsidian, Snowflake obsidian and Velvet Peacock Obsidian
Blocks negativity, Helps to protect against depression
When the lava is released from volcano, it undergoes a very rapid cooling which freezes the mechanisms of crystallization. The result is a volcanic glass with a uniform smooth texture.
Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, MgO, MnO, Sodium Oxide, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism
Biological Weathering, Chemical Weathering, Mechanical Weathering
Chemical Erosion, Coastal Erosion, Glacier Erosion
Heat Resistant, Impact Resistant
Afghanistan, Indonesia, Japan, Russia
Greece, Hungary, Iceland, Italy, Turkey
Argentina, Chile, Ecuador, Peru
Conglomerate is a sedimentary rock which forms from rounded gravel and boulder sized clasts which are cemented together in a matrix
From Latin conglomeratus, to roll together, i.e. from com together + glomerare to gather into a ball, from glomus (genitive glomeris) a ball
Coarse Grained Rock, Opaque Rock
Beige, Black, Brown, Buff, Light to Dark Grey, Orange, Rust, White, Yellow
Decorative Aggregates, Floor Tiles, Homes
As Building Stone, As Facing Stone, Garden Decoration, Office Buildings, Roof Tiles
As Dimension Stone, Cement Manufacture, Construction Aggregate, for Road Aggregate, Roadstone
Artifacts, Monuments, Sculpture, Small Figurines
Cemetery Markers, In aquifers, Tombstones
Orthoconglomerate and Paraconglomerate
Clasts are smooth to touch, Is one of the oldest rock, Matrix variable
Conglomerate forms where sediments consisting mainly of pebble and cobble-size clasts at least two millimeters in diameter starts accumulating.
Burial Metamorphism, Cataclastic Metamorphism, Regional Metamorphism
Chemical Erosion, Coastal Erosion
China, India, Kazakhstan, Mongolia, Russia, Uzbekistan
Namibia, Nigeria, South Africa
Austria, Denmark, Germany, Great Britain, Netherlands, Norway, Poland, Sweden, Switzerland, United Kingdom
New South Wales, New Zealand