Definition
Siltstone can be defined as a fine-grained sedimentary rock which mainly consists of consolidated silt
  
Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption
  
History
  
  
Origin
Unknown
  
Italy
  
Discoverer
Unknown
  
Unknown
  
Etymology
From English word silt and stone and from Proto-Indo-European root sal and stainaz
  
From a Latin word tophous then in Italian tufo and finally tuff
  
Class
Sedimentary Rocks
  
Igneous Rocks
  
Sub-Class
Durable Rock, Hard Rock
  
Durable Rock, Medium Hardness Rock
  
Family
  
  
Group
Not Applicable
  
Volcanic
  
Other Categories
Fine Grained Rock, Opaque Rock
  
Fine Grained Rock, Opaque Rock
  
Texture
Clastic
  
Clastic, Pyroclastic
  
Color
Brown, Red, Reddish Brown
  
Brown, Grey, Yellow
  
Maintenance
Less
  
More
  
Durability
Durable
  
Durable
  
Water Resistant
Yes
  
Yes
  
Scratch Resistant
Yes
  
Yes
  
Stain Resistant
No
  
No
  
Wind Resistant
Yes
  
No
  
Acid Resistant
Yes
  
No
  
Appearance
Rough
  
Dull, Vesicular and Foilated
  
Architecture
  
  
Interior Uses
Decorative Aggregates, Interior Decoration
  
Decorative Aggregates, Entryways, Flooring, Homes, Interior Decoration
  
Exterior Uses
As Building Stone, As Facing Stone, Garden Decoration
  
As Building Stone, As Facing Stone, Garden Decoration, Office Buildings, Paving Stone
  
Other Architectural Uses
Curbing
  
Curbing
  
Industry
  
  
Construction Industry
Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate, Making natural cement, Raw material for the manufacture of mortar
  
Building houses or walls, Construction Aggregate
  
Medical Industry
Not Yet Used
  
Not Yet Used
  
Antiquity Uses
Artifacts, Sculpture, Small Figurines
  
Artifacts, Monuments, Sculpture, Small Figurines
  
Other Uses
  
  
Commercial Uses
Raw material for the manufacture of mortar, Soil Conditioner
  
Creating Artwork
  
Types
Not Available
  
Welded tuff, Rhyolitic tuff, Basaltic tuff, Trachyte tuff, Andesitic tuff and Ignimbrite.
  
Features
Available in Lots of Colors and Patterns, Easily splits into thin plates, Generally rough to touch, High silica content, Very fine grained rock
  
Always found as volcanic pipes over deep continental crust
  
Archaeological Significance
  
  
Monuments
Not Yet Used
  
Used
  
Famous Monuments
Not Applicable
  
Easter Island in the Polynesian Triangle, Pacific Ocean
  
Sculpture
Used
  
Used
  
Famous Sculptures
Data Not Available
  
Data Not Available
  
Pictographs
Not Used
  
Used
  
Petroglyphs
Not Used
  
Used
  
Figurines
Used
  
Used
  
Fossils
Present
  
Absent
  
Formation
Siltstone is a type of sedimentary rock which is formed from fine rock particles. As the particles of eroded rock travel along with water, the edges of the rock are worn-out by water into a rounded shape.
  
Tuff is formed when large masses of ash and sand which are mixed with hot gases are ejected by a volcano and avalanche rapidly down its slopes.
  
Composition
  
  
Mineral Content
Calcite, Clay, Clay Minerals, Feldspar, Micas, Quartz, Sand, Silica, Silt
  
Calcite, Chlorite
  
Compound Content
Aluminium Oxide, CaO, Iron(III) Oxide, Potassium Oxide, MgO, Sodium Oxide, Silicon Dioxide
  
Hydrogen Sulfide, Sulfur Dioxide
  
Transformation
  
  
Metamorphism
No
  
Yes
  
Types of Metamorphism
Not Applicable
  
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact 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, Coastal Erosion, Glacier Erosion
  
Chemical Erosion, Coastal Erosion, Glacier Erosion, Sea Erosion, Water Erosion, Wind Erosion
  
Physical Properties
  
  
Hardness
6-7
  
4-6
  
Grain Size
Fine Grained
  
Fine Grained
  
Fracture
Conchoidal
  
Uneven
  
Streak
White
  
White
  
Porosity
Highly Porous
  
Highly Porous
  
Luster
Dull
  
Vitreous to Dull
  
Compressive Strength
Not Available
  
243.80 N/mm
2
  
5
Cleavage
Not Available
  
Not Available
  
Toughness
2.6
  
Not Available
  
Specific Gravity
2.54-2.73
  
2.73
  
Transparency
Opaque
  
Opaque
  
Density
2.6-2.7 g/cm3
  
1-1.8 g/cm3
  
Thermal Properties
  
  
Specific Heat Capacity
Not Available
  
0.20 kJ/Kg K
  
25
Resistance
Heat Resistant, Impact Resistant, Pressure Resistant, Water Resistant
  
Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant
  
Deposits in Eastern Continents
  
  
Asia
China, India, Kazakhstan, Mongolia, Russia, Uzbekistan
  
Afghanistan, Armenia, Azerbaijan, Burma, Cambodia, China, India, Indonesia, Iran, Japan, Malaysia, Mongolia, Nepal, North Korea, Pakistan, Saudi Arabia, Syria, Taiwan, Thailand, Turkey, Vietnam, Yemen
  
Africa
Namibia, Nigeria, South Africa
  
Cameroon, Cape Verde, Eritrea, Ethiopia, Kenya, Libya, Madagascar, Nigeria, Rwanda, South Africa, Sudan, Uganda
  
Europe
Austria, Denmark, Germany, Great Britain, Netherlands, Norway, Poland, Sweden, Switzerland, United Kingdom
  
France, Georgia, Germany, Greece, Iceland, Italy, Netherlands, Poland, Portugal, Spain, United Kingdom
  
Others
Greenland
  
Antarctica, Hawaii Islands
  
Deposits in Western Continents
  
  
North America
Canada, USA
  
Canada, Costa Rica, Panama, USA
  
South America
Brazil
  
Argentina, Bolivia, Brazil, Chile, Ecuador, Paraguay
  
Deposits in Oceania Continent
  
  
Australia
New South Wales, New Zealand
  
Central Australia, Western Australia
  
Siltstone vs Tuff 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. Siltstone vs Tuff characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Siltstone and Properties of Tuff. Learn more about Siltstone vs Tuff in the next section. The interior uses of Siltstone include Decorative aggregates and Interior decoration whereas the interior uses of Tuff include Decorative aggregates, Entryways, Flooring, Homes and Interior decoration. Due to some exceptional properties of Siltstone and Tuff, they have various applications in construction industry. The uses of Siltstone in construction industry include Building houses or walls, Cement manufacture, Construction aggregate, For road aggregate, Making natural cement, Raw material for the manufacture of mortar and that of Tuff include Building houses or walls, Construction aggregate.
More about Siltstone and Tuff
Here you can know more about Siltstone and Tuff. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Siltstone and Tuff consists of mineral content and compound content. The mineral content of Siltstone includes Calcite, Clay, Clay Minerals, Feldspar, Micas, Quartz, Sand, Silica, Silt and mineral content of Tuff includes Calcite, Chlorite. You can also check out the list of all Sedimentary Rocks. When we have to compare Siltstone vs Tuff, the texture, color and appearance plays an important role in determining the type of rock. Siltstone is available in brown, red, reddish brown colors whereas, Tuff is available in brown, grey, yellow colors. Appearance of Siltstone is Rough and that of Tuff is Dull, Vesicular and Foilated. Properties of rock is another aspect for Siltstone vs Tuff. The hardness of Siltstone is 6-7 and that of Tuff is 4-6. The types of Siltstone are Not Available whereas types of Tuff are Welded tuff, Rhyolitic tuff, Basaltic tuff, Trachyte tuff, Andesitic tuff and Ignimbrite.. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Siltstone and Tuff is white. The specific heat capacity of Siltstone is Not Available and that of Tuff is 0.20 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Siltstone is heat resistant, impact resistant, pressure resistant, water resistant whereas Tuff is heat resistant, impact resistant, pressure resistant, wear resistant.