Definition
Definition
Blueschist is a metamorphic rock which is generally blue in color and is formed under conditions of high pressure and low temperature
History
Origin
USA
Discoverer
Edgar Bailey
Etymology
From French schiste, Greek skhistos i.e. split
Class
Metamorphic Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Family
Group
-
Other Categories
Fine Grained Rock, Medium Grained Rock, Opaque Rock
Texture
Texture
Foliated
Color
Blue, Bluish - Grey, Purple, Shades of Blue
Maintenance
Less
Durability
Durable
Water Resistant
✔
✘
81% - Igneous Rocks Rocks
Scratch Resistant
✔
✘
86% - Igneous Rocks Rocks
Stain Resistant
✔
✘
66% - Igneous Rocks Rocks
Wind Resistant
✔
✘
49% - Igneous Rocks Rocks
Acid Resistant
✔
✘
48% - Igneous Rocks Rocks
Appearance
Dull and Banded
Uses
Architecture
Interior Uses
Floor Tiles, Flooring, Homes, Hotels, Kitchens
Exterior Uses
Garden Decoration, Office Buildings
Other Architectural Uses
-
Industry
Construction Industry
As Dimension Stone, Cobblestones, Rail Track Ballast, Roadstone
Medical Industry
-
Antiquity Uses
Artifacts, Monuments, Sculpture
Other Uses
Commercial Uses
Cemetery Markers, Commemorative Tablets, Creating Artwork, Curling, Tombstones
Types
Types
Metamorphic rock
Features
Has High structural resistance against erosion and climate, Very fine grained rock
Archaeological Significance
Monuments
-
Famous Monuments
-
Sculpture
-
Famous Sculptures
-
Pictographs
-
Petroglyphs
-
Figurines
-
Fossils
Absent
Formation
Formation
Blueschist forms due to the metamorphism of basalt and other rocks with similar composition at high pressures and low temperatures and approximately corresponding to a depth of 15 to 30 kilometers and 200 to 500 °C.
Composition
Mineral Content
Albite, Chlorite, Epidote, Garnet, Glaucophane, Lawsonite, Muscovite or Illite, Quartz
Compound Content
Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, MgO, MnO, Sodium Oxide, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide
Transformation
Metamorphism
✔
✘
97% - Igneous Rocks Rocks
Types of Metamorphism
-
Weathering
✔
✘
99% - Igneous Rocks Rocks have it !
Types of Weathering
Mechanical Weathering
Erosion
✔
✘
92% - Igneous Rocks Rocks have it !
Types of Erosion
Chemical Erosion, Coastal Erosion, Water Erosion, Wind Erosion
Properties
Physical Properties
Hardness
3.5-4
1
7
👆🏻
Grain Size
Fine to Medium Grained
Fracture
Conchoidal
Streak
White to Grey
Porosity
Highly Porous
Luster
Dull
Compressive Strength
220.00 N/mm2
Rank: 9 (Overall)
0.15
450
👆🏻
Cleavage
Slaty
Toughness
1.5
Specific Gravity
3-3.2
0
8.4
👆🏻
Transparency
Opaque
Density
2.8-2.9 g/cm3
0
1400
👆🏻
Thermal Properties
Specific Heat Capacity
0.84 kJ/Kg K
Rank: 15 (Overall)
0.14
3.2
👆🏻
Resistance
Impact Resistant, Pressure Resistant
Reserves
Deposits in Eastern Continents
Asia
Japan, Turkey
Africa
Egypt, Ethiopia, South Africa
Europe
France, Greece, Iceland
Others
-
Deposits in Western Continents
North America
USA
South America
-
Deposits in Oceania Continent
Australia
New Zealand