Tachylite and Rhyolite
Definition
Definition
Tachylite is a vitreous form of basaltic volcanic glass. This glass is formed naturally by the rapid cooling of molten basalt
Rhyolite is a fine-grained igneous rock which is rich in silica
History
Origin
Iceland
North America
Discoverer
Unknown
Ferdinand von Richthofen
Etymology
From German Tachylite, from tachy- + Greek lutos soluble, melting
From German Rhyolit, from Greek rhuax lava stream + lithos stone
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
Family
Group
Volcanic
Volcanic
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock
Texture
Texture
Vitreous
Aphanitic, Glassy, Porphyritic
Color
Black, Dark Brown
Grey, White, Light Black
Maintenance
More
More
Durability
Durable
Durable
Water Resistant
Yes
Yes
Scratch Resistant
No
Yes
Stain Resistant
No
Yes
Wind Resistant
Yes
Yes
Acid Resistant
Yes
Yes
Appearance
Glassy
Banded
Uses
Architecture
Interior Uses
Decorative Aggregates, Interior Decoration
Decorative Aggregates, Homes, Hotels, Interior Decoration, Kitchens
Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration, Paving Stone
As Building Stone, As Facing Stone, Paving Stone, Office Buildings
Other Architectural Uses
Curbing
Not Yet Used
Industry
Construction Industry
Cutting Tool, Knives, Landscaping, Scrapers
Arrowheads, As Dimension Stone, Building houses or walls, Construction Aggregate, Cutting Tool, for Road Aggregate, Knives
Medical Industry
Not Yet Used
Not Yet Used
Antiquity Uses
Artifacts
Artifacts
Other Uses
Commercial Uses
Cemetery Markers, Creating Artwork
Gemstone, Laboratory bench tops, Jewelry
Types
Types
Not Available
Pumice Rocks, Obsidian Rocks, Perlite Rocks, Porphyritic Rocks.
Features
Available in Lots of Colors and Patterns, Clasts are smooth to touch, NA
Acidic in nature, Available in lots of colors
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
Not Used
Petroglyphs
Used
Not Used
Figurines
Not Yet Used
Not Yet Used
Fossils
Absent
Absent
Formation
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.
Rhyolite is a felsic extrusive rock and due to its high silica content, rhyolite lava is very viscous and is volcanic equivalent of granite.
Composition
Mineral Content
Feldspar, Olivine
Biotite, Feldspar, Hornblade, Plagioclase, Pyroxene, Quartz
Compound Content
Fe, Mg
Ca, Fe, Potassium Oxide, Mg, Potassium, Silicon Dioxide, Sodium
Transformation
Metamorphism
Yes
Yes
Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Regional Metamorphism
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, Sea Erosion, Water Erosion, Wind Erosion
Properties
Physical Properties
Hardness
5.5
6-7
Grain Size
Medium to Fine Coarse Grained
Large and Coarse Grained
Fracture
Conchoidal
Sub-conchoidal
Streak
Vermilion
Colorless
Porosity
Less Porous
Highly Porous
Luster
Resinous
Earthy
Compressive Strength
206.00 N/mm2
8
140.00 N/mm2
15
Cleavage
Not Available
Not Available
Toughness
Not Available
2
Specific Gravity
2.4
2.65-2.67
Transparency
Opaque
Opaque
Density
3.058 g/cm3
2.4-2.6 g/cm3
Thermal Properties
Specific Heat Capacity
0.56 kJ/Kg K
22
Not Available
Resistance
Heat Resistant, Impact Resistant, Wear Resistant
Heat Resistant, Wear Resistant
Reserves
Deposits in Eastern Continents
Asia
Cambodia, Russia, South Korea
China, India
Africa
East Africa
Angola, Egypt, Madagascar, Namibia, Nigeria, South Africa
Europe
England, Germany, Hungary, Iceland, Scotland, Sweden
Germany, Iceland, Ireland, Italy, Spain
Others
Hawaii Islands
Not Yet Found
Deposits in Western Continents
North America
USA
Canada, USA
South America
Not Yet Found
Argentina, Bolivia, Chile, Colombia, Ecuador, Peru, Venezuela
Deposits in Oceania Continent
Australia
Victoria
New Zealand, Queensland, Western Australia
All about Tachylite and Rhyolite Properties
Know all about Tachylite and Rhyolite properties here. All properties of rocks are important as they define the type of rock and its application. Tachylite and Rhyolite belong to Igneous Rocks.Texture of Tachylite is Vitreous whereas that of Rhyolite is Aphanitic, Glassy, Porphyritic. Tachylite appears Glassy and Rhyolite appears Banded. The luster of Tachylite is resinous while that of Rhyolite is earthy. Tachylite is available in black, dark brown colors whereas Rhyolite is available in grey, white, light black colors. The commercial uses of Tachylite are cemetery markers, creating artwork and that of Rhyolite are gemstone, laboratory bench tops, jewelry.
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