Definition
Tachylite is a vitreous form of basaltic volcanic glass. This glass is formed naturally by the rapid cooling of molten basalt
  
Schist is a medium grade metamorphic rock with medium to large, flat, sheet like grains in a preferred orientation
  
History
  
  
Origin
Iceland
  
Unknown
  
Discoverer
Unknown
  
Unknown
  
Etymology
From German Tachylite, from tachy- + Greek lutos soluble, melting
  
From French schiste, Greek skhistos i.e. split
  
Class
Igneous Rocks
  
Metamorphic Rocks
  
Sub-Class
Durable Rock, Medium Hardness Rock
  
Durable Rock, Medium Hardness Rock
  
Family
  
  
Group
Volcanic
  
Not Applicable
  
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
  
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
  
Texture
Vitreous
  
Foliated, Platy
  
Color
Black, Dark Brown
  
Black, Blue, Brown, Dark Brown, Green, Grey, Silver
  
Maintenance
More
  
Less
  
Durability
Durable
  
Durable
  
Water Resistant
Yes
  
Yes
  
Scratch Resistant
No
  
No
  
Stain Resistant
No
  
No
  
Wind Resistant
Yes
  
No
  
Acid Resistant
Yes
  
No
  
Appearance
Glassy
  
Layered and Shiny
  
Architecture
  
  
Interior Uses
Decorative Aggregates, Interior Decoration
  
Decorative Aggregates, Floor Tiles, Interior Decoration
  
Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration, Paving Stone
  
Garden Decoration, Paving Stone
  
Other Architectural Uses
Curbing
  
Not Yet Used
  
Industry
  
  
Construction Industry
Cutting Tool, Knives, Landscaping, Scrapers
  
As Dimension Stone, Building houses or walls, Cement Manufacture, for Road Aggregate, Roadstone
  
Medical Industry
Not Yet Used
  
Not Yet Used
  
Antiquity Uses
Artifacts
  
Artifacts
  
Other Uses
  
  
Commercial Uses
Cemetery Markers, Creating Artwork
  
Used in aquariums, Writing Slates
  
Types
Not Available
  
Mica Schists, Calc-Silicate Schists, Graphite Schists, Blueschists, Whiteschists, Greenschists, Hornblende Schist, Talc Schist, Chlorite Schist, Garnet Schist, Glaucophane schist.
  
Features
Available in Lots of Colors and Patterns, Clasts are smooth to touch, NA
  
Easily splits into thin plates, Smooth to touch
  
Archaeological Significance
  
  
Monuments
Not Yet Used
  
Not Yet Used
  
Famous Monuments
Not Applicable
  
Not Applicable
  
Sculpture
Not Yet Used
  
Not Yet Used
  
Famous Sculptures
Not Applicable
  
Not Applicable
  
Pictographs
Used
  
Used
  
Petroglyphs
Used
  
Used
  
Figurines
Not Yet Used
  
Not Yet Used
  
Fossils
Absent
  
Absent
  
Formation
Tachylite is a fine-grained, hard rock which is a type of metasomatite, essentially altered basalt. It forms with or without crystallization, either below the surface as intrusive rocks or on the surface as extrusive rocks.
  
Schist formed by dynamic metamorphism at high temperatures and pressures that aligns the grains of mica, hornblende and other elongated minerals into thin layers.
  
Composition
  
  
Mineral Content
Feldspar, Olivine
  
Alusite, Amphibole, Biotite, Chlorite, Epidote, Feldspar, Garnet, Graphite, Hornblade, Kyanite, Micas, Muscovite or Illite, Porphyroblasts, Quartz, Sillimanite, Staurolite, Talc
  
Compound Content
Fe, Mg
  
CaO, Carbon Dioxide, MgO
  
Transformation
  
  
Metamorphism
Yes
  
No
  
Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional Metamorphism
  
Not Applicable
  
Weathering
Yes
  
Yes
  
Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
  
Biological Weathering, Chemical Weathering, Mechanical Weathering
  
Erosion
Yes
  
Yes
  
Types of Erosion
Chemical Erosion, Sea Erosion, Water Erosion, Wind Erosion
  
Chemical Erosion, Coastal Erosion, Glacier Erosion
  
Physical Properties
  
  
Hardness
5.5
  
3.5-4
  
Grain Size
Medium to Fine Coarse Grained
  
Medium to Fine Coarse Grained
  
Fracture
Conchoidal
  
Conchoidal
  
Streak
Vermilion
  
White
  
Porosity
Less Porous
  
Highly Porous
  
Luster
Resinous
  
Shiny
  
Compressive Strength
206.00 N/mm
2
  
8
Not Available
  
Cleavage
Not Available
  
Slaty
  
Toughness
Not Available
  
1.5
  
Specific Gravity
2.4
  
2.5-2.9
  
Transparency
Opaque
  
Opaque
  
Density
3.058 g/cm3
  
2.8-2.9 g/cm3
  
Thermal Properties
  
  
Specific Heat Capacity
0.56 kJ/Kg K
  
22
Not Available
  
Resistance
Heat Resistant, Impact Resistant, Wear Resistant
  
Impact Resistant, Pressure Resistant, Water Resistant
  
Deposits in Eastern Continents
  
  
Asia
Cambodia, Russia, South Korea
  
Afghanistan, Bangladesh, Bhutan, China, India, Japan, Kazakhstan, Malaysia, Pakistan, Russia, Thailand, Turkey, Vietnam
  
Africa
East Africa
  
Egypt, Ethiopia, Morocco, Nigeria, South Africa
  
Europe
England, Germany, Hungary, Iceland, Scotland, Sweden
  
Austria, England, France, Georgia, Germany, Italy, Liechtenstein, Monaco, Norway, Slovenia, Spain, Sweden, Switzerland
  
Others
Hawaii Islands
  
Not Yet Found
  
Deposits in Western Continents
  
  
North America
USA
  
Canada, Costa Rica, Cuba, Mexico, Panama, USA
  
South America
Not Yet Found
  
Brazil, Colombia, Guyana
  
Deposits in Oceania Continent
  
  
Australia
Victoria
  
New South Wales, New Zealand, Queensland
  
Tachylite vs Schist Characteristics
Though some rocks look identical, they have certain characteristics which distinguish them from others. Characteristics of rocks include texture, appearance, color, fracture, streak, hardness etc. Tachylite vs Schist characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Tachylite and Properties of Schist. Learn more about Tachylite vs Schist in the next section. The interior uses of Tachylite include Decorative aggregates and Interior decoration whereas the interior uses of Schist include Decorative aggregates, Floor tiles and Interior decoration. Due to some exceptional properties of Tachylite and Schist, they have various applications in construction industry. The uses of Tachylite in construction industry include Cutting tool, Knives, Landscaping, Scrapers and that of Schist include As dimension stone, Building houses or walls, Cement manufacture, For road aggregate, Roadstone.
More about Tachylite and Schist
Here you can know more about Tachylite and Schist. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Tachylite and Schist consists of mineral content and compound content. The mineral content of Tachylite includes Feldspar, Olivine and mineral content of Schist includes Alusite, Amphibole, Biotite, Chlorite, Epidote, Feldspar, Garnet, Graphite, Hornblade, Kyanite, Micas, Muscovite or Illite, Porphyroblasts, Quartz, Sillimanite, Staurolite, Talc. You can also check out the list of all Igneous Rocks. When we have to compare Tachylite vs Schist, the texture, color and appearance plays an important role in determining the type of rock. Tachylite is available in black, dark brown colors whereas, Schist is available in black, blue, brown, dark brown, green, grey, silver colors. Appearance of Tachylite is Glassy and that of Schist is Layered and Shiny. Properties of rock is another aspect for Tachylite vs Schist. The hardness of Tachylite is 5.5 and that of Schist is 3.5-4. The types of Tachylite are Not Available whereas types of Schist are Mica Schists, Calc-Silicate Schists, Graphite Schists, Blueschists, Whiteschists, Greenschists, Hornblende Schist, Talc Schist, Chlorite Schist, Garnet Schist, Glaucophane schist.. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Tachylite is vermilion while that of Schist is white. The specific heat capacity of Tachylite is 0.56 kJ/Kg K and that of Schist is Not Available. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Tachylite is heat resistant, impact resistant, wear resistant whereas Schist is impact resistant, pressure resistant, water resistant.