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Obsidian
Obsidian

Amphibolite
Amphibolite



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Obsidian and Amphibolite

1 Definition
1.1 Definition
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
Amphibolite can be defined as a granular metamorphic rock which mainly consist of hornblende and plagioclase
2.2 History
2.2.1 Origin
Ethiopia
Unknown
2.2.3 Discoverer
Obsius
Alexandre Brongniart
2.3 Etymology
From Latin obsidianus, misprint of Obsianus (lapis) (stone) of Obsius
From Amphibole + -ite
2.4 Class
Igneous Rocks
Metamorphic Rocks
2.4.1 Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
2.6 Family
2.6.1 Group
Volcanic
Not Applicable
2.7 Other Categories
Opaque Rock
Coarse Grained Rock, Medium Grained Rock, Opaque Rock
3 Texture
3.1 Texture
Glassy
Banded, Foliated, Massive
3.2 Color
Black, Blue, Brown, Green, Orange, Red, Tan, Yellow
Black, Brown, Green, Grey
3.3 Maintenance
Less
Less
3.4 Durability
Durable
Durable
3.4.1 Water Resistant
3.4.2 Scratch Resistant
3.4.3 Stain Resistant
3.4.4 Wind Resistant
3.4.5 Acid Resistant
3.5 Appearance
Shiny
Foliated
4 Uses
4.1 Architecture
4.1.1 Interior Uses
Decorative Aggregates, Interior Decoration
Countertops, Decorative Aggregates, Entryways, Floor Tiles, Flooring, Homes, Hotels, Kitchens
4.1.2 Exterior Uses
Garden Decoration
As Building Stone, As Facing Stone, Paving Stone, Office Buildings
4.1.3 Other Architectural Uses
Not Yet Used
Curbing
4.2 Industry
4.2.1 Construction Industry
Arrowheads, Cutting Tool, Knives, Scrapers, Spear Points
As Dimension Stone, Building houses or walls, Cobblestones, Construction Aggregate, for Road Aggregate, Landscaping, Production of Glass and Ceramics, Roadstone
4.2.2 Medical Industry
Surgery
Not Yet Used
4.3 Antiquity Uses
Artifacts, Jewellery
Artifacts, Sculpture, Small Figurines
4.4 Other Uses
4.4.1 Commercial Uses
Creating Artwork, Mirror, Used in aquariums
Cemetery Markers, Commemorative Tablets, Creating Artwork
5 Types
5.1 Types
Fireworks Obsidian, Mahogany, Sheen Obsidian, Snowflake obsidian and Velvet Peacock Obsidian
Hornblendite
5.2 Features
Blocks negativity, Helps to protect against depression
Clasts are smooth to touch, Matrix variable, Surfaces are often shiny
5.3 Archaeological Significance
5.3.1 Monuments
Not Yet Used
Used
5.3.2 Famous Monuments
Not Applicable
Data Not Available
5.3.3 Sculpture
Not Yet Used
Used
5.3.4 Famous Sculptures
Not Applicable
Data Not Available
5.3.5 Pictographs
Used
Not Used
5.3.6 Petroglyphs
Used
Not Used
5.3.7 Figurines
Not Yet Used
Used
5.4 Fossils
Absent
Absent
6 Formation
6.1 Formation
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.
Amphibolite is a coarse-grained metamorphic rock which forms by metamorphism of mafic igneous rocks like basalt and gabbro or from the metamorphism of clay-rich sedimentary rocks like marl or graywacke.
6.2 Composition
6.2.1 Mineral Content
Not Available
Amphibole, Andalusite, Biotite, Calcite, Epidote, Garnet, Hornblade, Kyanite, Magnetite, Olivine, Plagioclase, Pyroxene, Staurolite, Wollastonite
6.2.2 Compound Content
Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, MgO, MnO, Sodium Oxide, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide
Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, MgO, MnO, Sodium Oxide, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide
6.3 Transformation
6.3.1 Metamorphism
6.3.2 Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism
Not Applicable
6.3.3 Weathering
6.3.4 Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
Chemical Weathering, Mechanical Weathering
6.3.5 Erosion
6.3.6 Types of Erosion
Chemical Erosion, Coastal Erosion, Glacier Erosion
Chemical Erosion, Glacier Erosion, Sea Erosion, Wind Erosion
7 Properties
7.1 Physical Properties
7.1.1 Hardness
5-5.56-7
Coal
1 7
7.1.2 Grain Size
Not Applicable
Medium to Coarse Grained
7.1.3 Fracture
Conchoidal
Irregular to Conchoidal
7.1.4 Streak
White
White to Grey
7.1.5 Porosity
Very Less Porous
Less Porous
7.1.6 Luster
Vitreous
Vitreous to Dull
7.1.7 Compressive Strength
0.15 N/mm2NA
Slate
0.15 450
7.1.8 Cleavage
Non-Existent
Irregular
7.1.9 Toughness
Not Available
2.3
7.1.10 Specific Gravity
2.6-2.72.5
Granite
0 8.4
7.1.11 Transparency
Translucent
Opaque
7.1.12 Density
2.6 g/cm32.85-3.07 g/cm3
Granite
0 1400
7.2 Thermal Properties
7.2.1 Specific Heat Capacity
0.92 kJ/Kg KNA
What Is Granulite
0.14 3.2
7.2.2 Resistance
Heat Resistant, Impact Resistant
Heat Resistant, Pressure Resistant, Wear Resistant
8 Reserves
8.1 Deposits in Eastern Continents
8.1.1 Asia
Afghanistan, Indonesia, Japan, Russia
Russia, Turkey
8.1.2 Africa
Kenya
Burundi, Djibouti, Eritrea, Ethiopia, Kenya, Madagascar, Rwanda, Somalia, South Africa, Sudan, Tanzania, Uganda
8.1.3 Europe
Greece, Hungary, Iceland, Italy, Turkey
Germany, Greece, Iceland, Norway, Poland
8.1.4 Others
Not Yet Found
Not Yet Found
8.2 Deposits in Western Continents
8.2.1 North America
Canada, Mexico, USA
Canada, USA
8.2.2 South America
Argentina, Chile, Ecuador, Peru
Brazil
8.3 Deposits in Oceania Continent
8.3.1 Australia
New Zealand
South Australia, Western Australia

All about Obsidian and Amphibolite Properties

Know all about Obsidian and Amphibolite properties here. All properties of rocks are important as they define the type of rock and its application. Obsidian belongs to Igneous Rocks while Amphibolite belongs to Metamorphic Rocks.Texture of Obsidian is Glassy whereas that of Amphibolite is Banded, Foliated, Massive. Obsidian appears Shiny and Amphibolite appears Foliated. The luster of Obsidian is vitreous while that of Amphibolite is vitreous to dull. Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors whereas Amphibolite is available in black, brown, green, grey colors. The commercial uses of Obsidian are creating artwork, mirror, used in aquariums and that of Amphibolite are cemetery markers, commemorative tablets, creating artwork.