Definition
Rhyodacite is an extrusive volcanic rock intermediate in composition between dacite and rhyolite
History
Origin
USA
Discoverer
Unknown
Etymology
Rhyo lite + dacite : a rock intermediate between rhyolite and dacite that is the extrusive equivalent of granodiorite
Class
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
Other Categories
Fine Grained Rock, Opaque Rock
Texture
Earthy
Color
Black to Grey, Dark Greenish - Grey
Maintenance
More
Durability
Durable
Water Resistant
✔
✘
81% - Igneous Rocks Rocks have it !
Scratch Resistant
✔
✘
86% - Igneous Rocks Rocks have it !
Stain Resistant
✔
✘
66% - Igneous Rocks Rocks
Wind Resistant
✔
✘
49% - Igneous Rocks Rocks
Acid Resistant
✔
✘
48% - Igneous Rocks Rocks
Appearance
Skeletal
Architecture
Interior Uses
Decorative Aggregates, Interior Decoration
Exterior Uses
As Building Stone, Garden Decoration
Other Architectural Uses
Curbing
Industry
Construction Industry
As Dimension Stone, Construction Aggregate, for Road Aggregate, Landscaping
Medical Industry
-
Antiquity Uses
Artifacts
Other Uses
Commercial Uses
Cemetery Markers, Creating Artwork
Types
Intermediate volcanic rock
Features
Available in Lots of Colors and Patterns
Archaeological Significance
Monuments
-
Famous Monuments
-
Sculpture
-
Famous Sculptures
-
Pictographs
-
Petroglyphs
-
Figurines
-
Fossils
Absent
Formation
Rhyodacite 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.
Composition
Mineral Content
Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Magnetite, Plagioclase, Pyroxene, Quartz, Zircon
Compound Content
Ca, Fe, Potassium Oxide, Potassium, Silicon Dioxide
Transformation
Metamorphism
✔
✘
97% - Igneous Rocks Rocks have it !
Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional Metamorphism
Weathering
✔
✘
99% - Igneous Rocks Rocks have it !
Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
Erosion
✔
✘
92% - Igneous Rocks Rocks have it !
Types of Erosion
Chemical Erosion, Coastal Erosion, Glacier Erosion
Physical Properties
Hardness
5.5-6
1
7
👆🏻
Grain Size
Fine Grained
Fracture
Conchoidal
Streak
Black
Porosity
Less Porous
Luster
Greasy to Dull
Compressive Strength
200.50 N/mm2
Rank: 12 (Overall)
0.15
450
👆🏻
Cleavage
-
Toughness
2.1
Specific Gravity
2.34-2.40
0
8.4
👆🏻
Transparency
Opaque
Density
-9999 g/cm3
0
1400
👆🏻
Thermal Properties
Specific Heat Capacity
1.12 kJ/Kg K
Rank: 7 (Overall)
0.14
3.2
👆🏻
Resistance
Heat Resistant
Deposits in Eastern Continents
Asia
China, India, Iran, Saudi Arabia, Sri Lanka, Taiwan, Thailand, Turkey, Vietnam
Africa
Angola, Egypt, Madagascar, Namibia, Nigeria, South Africa
Europe
Austria, Belgium, Finland, France, Germany, Italy, Norway, Sardinia, Spain, Switzerland
Others
-
Deposits in Western Continents
North America
Canada, USA
South America
-
Deposits in Oceania Continent
Australia
-