1 Definition
1.1 Definition
Rhyolite is a fine-grained igneous rock which is rich in silica
Tachylite is a vitreous form of basaltic volcanic glass. This glass is formed naturally by the rapid cooling of molten basalt
1.2 History
1.2.1 Origin
1.2.2 Discoverer
Ferdinand von Richthofen
Unknown
1.3 Etymology
From German Rhyolit, from Greek rhuax lava stream + lithos stone
From German Tachylite, from tachy- + Greek lutos soluble, melting
1.4 Class
Igneous Rocks
Igneous Rocks
1.4.1 Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
1.5 Family
1.5.1 Group
1.6 Other Categories
Coarse Grained Rock, Opaque Rock
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
2 Texture
2.1 Texture
Aphanitic, Glassy, Porphyritic
Vitreous
2.2 Color
Grey, White, Light Black
Black, Dark Brown
2.3 Maintenance
2.4 Durability
2.4.1 Water Resistant
2.4.2 Scratch Resistant
2.4.3 Stain Resistant
2.4.4 Wind Resistant
2.4.5 Acid Resistant
2.5 Appearance
3 Uses
3.1 Architecture
3.1.1 Interior Uses
Decorative Aggregates, Homes, Hotels, Interior Decoration, Kitchens
Decorative Aggregates, Interior Decoration
3.1.2 Exterior Uses
As Building Stone, As Facing Stone, Paving Stone, Office Buildings
As Building Stone, As Facing Stone, Garden Decoration, Paving Stone
3.1.3 Other Architectural Uses
3.2 Industry
3.2.1 Construction Industry
Arrowheads, As Dimension Stone, Building houses or walls, Construction Aggregate, Cutting Tool, for Road Aggregate, Knives
Cutting Tool, Knives, Landscaping, Scrapers
3.2.2 Medical Industry
Not Yet Used
Not Yet Used
3.3 Antiquity Uses
1.2 Other Uses
1.2.1 Commercial Uses
Gemstone, Laboratory bench tops, Jewelry
Cemetery Markers, Creating Artwork
2 Types
2.1 Types
Pumice Rocks, Obsidian Rocks, Perlite Rocks, Porphyritic Rocks.
Not Available
2.2 Features
Acidic in nature, Available in lots of colors
Available in Lots of Colors and Patterns, Clasts are smooth to touch, NA
2.3 Archaeological Significance
2.3.1 Monuments
Not Yet Used
Not Yet Used
2.4.2 Famous Monuments
Not Applicable
Not Applicable
2.4.4 Sculpture
Not Yet Used
Not Yet Used
2.5.1 Famous Sculptures
Not Applicable
Not Applicable
2.6.2 Pictographs
2.6.3 Petroglyphs
2.6.4 Figurines
Not Yet Used
Not Yet Used
2.7 Fossils
3 Formation
3.1 Formation
Rhyolite is a felsic extrusive rock and due to its high silica content, rhyolite lava is very viscous and is volcanic equivalent of granite.
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.
3.2 Composition
3.2.1 Mineral Content
Biotite, Feldspar, Hornblade, Plagioclase, Pyroxene, Quartz
Feldspar, Olivine
3.2.2 Compound Content
Ca, Fe, Potassium Oxide, Mg, Potassium, Silicon Dioxide, Sodium
Fe, Mg
3.3 Transformation
3.3.1 Metamorphism
3.3.2 Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Regional Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional Metamorphism
3.3.3 Weathering
3.3.4 Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
3.3.5 Erosion
3.3.6 Types of Erosion
Chemical Erosion, Sea Erosion, Water Erosion, Wind Erosion
Chemical Erosion, Sea Erosion, Water Erosion, Wind Erosion
4 Properties
4.1 Physical Properties
4.1.1 Hardness
4.1.2 Grain Size
Large and Coarse Grained
Medium to Fine Coarse Grained
4.1.3 Fracture
Sub-conchoidal
Conchoidal
4.1.4 Streak
4.1.5 Porosity
Highly Porous
Less Porous
4.1.6 Luster
4.1.7 Compressive Strength
140.00 N/mm2206.00 N/mm2
0.15
450
4.1.8 Cleavage
Not Available
Not Available
4.1.9 Toughness
4.1.10 Specific Gravity
4.1.11 Transparency
4.1.12 Density
2.4-2.6 g/cm33.058 g/cm3
0
1400
4.2 Thermal Properties
4.2.1 Specific Heat Capacity
4.2.2 Resistance
Heat Resistant, Wear Resistant
Heat Resistant, Impact Resistant, Wear Resistant
5 Reserves
5.1 Deposits in Eastern Continents
5.1.1 Asia
China, India
Cambodia, Russia, South Korea
5.1.2 Africa
Angola, Egypt, Madagascar, Namibia, Nigeria, South Africa
East Africa
5.1.3 Europe
Germany, Iceland, Ireland, Italy, Spain
England, Germany, Hungary, Iceland, Scotland, Sweden
5.1.4 Others
Not Yet Found
Hawaii Islands
5.2 Deposits in Western Continents
5.2.1 North America
5.2.2 South America
Argentina, Bolivia, Chile, Colombia, Ecuador, Peru, Venezuela
Not Yet Found
5.3 Deposits in Oceania Continent
5.3.1 Australia
New Zealand, Queensland, Western Australia
Victoria