Definition
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
  
Mugearite is a type of oligoclase bearing basalt, also comprising of olivine, apatite, and opaque oxides
  
History
  
  
Origin
Unknown
  
Skye, Scotland
  
Discoverer
Alexandre Brongniart and René Just Haüy
  
Alfred Harker
  
Etymology
From Greek trakhus rough’ or trakhutēs roughness
  
From mugear + -ite
  
Class
Igneous Rocks
  
Igneous Rocks
  
Sub-Class
Durable Rock, Medium Hardness Rock
  
Durable Rock, Medium Hardness Rock
  
Family
  
  
Group
Volcanic
  
Volcanic
  
Other Categories
Fine Grained Rock, Opaque Rock
  
Opaque Rock
  
Texture
Aphanitic to Porphyritic
  
Glassy, Massive, Porphyritic, Scoriaceous, Vesicular
  
Color
Black, Brown, Dark Greenish - Grey, Green, Grey, Light to Dark Grey, White
  
Black, Brown, Light to Dark Grey
  
Maintenance
Less
  
Less
  
Durability
Durable
  
Durable
  
Water Resistant
Yes
  
Yes
  
Scratch Resistant
Yes
  
Yes
  
Stain Resistant
Yes
  
Yes
  
Wind Resistant
Yes
  
No
  
Acid Resistant
No
  
No
  
Appearance
Banded
  
Dull and Soft
  
Architecture
  
  
Interior Uses
Decorative Aggregates, Flooring, Homes, Interior Decoration
  
Floor Tiles, Flooring, Homes, Hotels
  
Exterior Uses
As Building Stone, As Facing Stone, Paving Stone, Garden Decoration, Office Buildings
  
As Building Stone, Garden Decoration
  
Other Architectural Uses
Curbing
  
Curbing
  
Industry
  
  
Construction Industry
As Dimension Stone, Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate, Landscaping, Making natural cement, Manufacture of Magnesium and Dolomite Refractories
  
As Dimension Stone, Cobblestones, Rail Track Ballast, Roadstone
  
Medical Industry
Not Yet Used
  
Not Yet Used
  
Antiquity Uses
Artifacts, Monuments, Sculpture, Small Figurines
  
Artifacts, Monuments, Sculpture
  
Other Uses
  
  
Commercial Uses
Cemetery Markers, Creating Artwork
  
Creating Artwork
  
Types
Not Available
  
Alkaline Basalt, Boninite, High Alumina Basalt, Mid Ocean Ridge Basalt (MORB), Tholeiitic Basalt, Basaltic trachyandesite, Mugearite and Shoshonite
  
Features
Available in Lots of Colors and Patterns, Is one of the oldest rock, Matrix variable
  
Has High structural resistance against erosion and climate, Very fine grained rock
  
Archaeological Significance
  
  
Monuments
Used
  
Used
  
Famous Monuments
Data Not Available
  
Data Not Available
  
Sculpture
Used
  
Used
  
Famous Sculptures
Data Not Available
  
Data Not Available
  
Pictographs
Used
  
Used
  
Petroglyphs
Used
  
Used
  
Figurines
Used
  
Used
  
Fossils
Absent
  
Absent
  
Formation
Trachyte is an igneous volcanic rock with an aphanitic to porphyritic texture. It is the volcanic equivalent of syenite rock and forms as a result of magmatic differentiation.
  
Mugearite forms when lava reaches the Earth's surface near an active volcano. The temperature of lava is between 1100 to 1250° C when it gets to the surface.
  
Composition
  
  
Mineral Content
Augite, Biotite, Feldspar, Hornblade, Plagioclase, Quartz
  
Olivine, Plagioclase, Pyroxene
  
Compound Content
Potassium Oxide, Sodium Oxide, Silicon Dioxide
  
Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, MgO, MnO, Sodium Oxide, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide
  
Transformation
  
  
Metamorphism
Yes
  
Yes
  
Types of Metamorphism
Cataclastic Metamorphism, Contact Metamorphism, Regional Metamorphism
  
Burial Metamorphism, Impact Metamorphism
  
Weathering
Yes
  
Yes
  
Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
  
Biological Weathering, Chemical Weathering
  
Erosion
Yes
  
No
  
Types of Erosion
Chemical Erosion, Coastal Erosion, Glacier Erosion, Sea Erosion, Water Erosion, Wind Erosion
  
Not Applicable
  
Physical Properties
  
  
Hardness
6
  
6
  
Grain Size
Fine Grained
  
Not Applicable
  
Fracture
Not Available
  
Conchoidal
  
Streak
White
  
White to Grey
  
Porosity
Less Porous
  
Less Porous
  
Luster
Metallic
  
Not Available
  
Compressive Strength
150.00 N/mm2
  
14
37.50 N/mm2
  
27
Cleavage
Not Available
  
Not Applicable
  
Toughness
Not Available
  
2.3
  
Specific Gravity
2.7
  
2.8-3
  
Transparency
Opaque
  
Opaque
  
Density
2.43-2.45 g/cm3
  
2.9-3.1 g/cm3
  
Thermal Properties
  
  
Specific Heat Capacity
Not Available
  
0.84 kJ/Kg K
  
15
Resistance
Heat Resistant, Impact Resistant, Wear Resistant
  
Heat Resistant, Pressure Resistant, Wear Resistant
  
Deposits in Eastern Continents
  
  
Asia
China, India, Iran, Saudi Arabia, Sri Lanka, Taiwan, Thailand, Turkey, Vietnam
  
India, Russia
  
Africa
Angola, Egypt, Madagascar, Namibia, Nigeria, South Africa
  
South Africa
  
Europe
Bulgaria, England, Germany, Norway, Romania, Switzerland
  
Iceland
  
Others
Not Yet Found
  
Not Yet Found
  
Deposits in Western Continents
  
  
North America
USA
  
Canada, USA
  
South America
Brazil, Chile
  
Brazil
  
Deposits in Oceania Continent
  
  
Australia
New Zealand, Queensland, South Australia, Western Australia
  
Not Yet Found