Definition
Rapakivi Granite is a hornblende-biotite Granite containing large rounded crystals of orthoclase which are mantled with oligoclase
  
Argillites are highly compact sedimentary or slightly metamorphosed rocks that consist largely or wholly of particles of clay or silt but lack the fissility of shale or the cleavage characteristic of slate
  
History
  
  
Origin
Finland, Europe
  
Unknown
  
Discoverer
Jakob Sederholm
  
Unknown
  
Etymology
From Finnish Rapakivi which stands for crumbly rock
  
From Latin Argilla (clay) and -ite in English which became agrilla+ -ite = Argillite
  
Class
Igneous Rocks
  
Sedimentary Rocks
  
Sub-Class
Durable Rock, Hard Rock
  
Durable Rock, Soft Rock
  
Family
  
  
Group
Plutonic
  
Not Applicable
  
Other Categories
Coarse Grained Rock, Opaque Rock
  
Fine Grained Rock, Opaque Rock
  
Texture
Granular, Phaneritic
  
Clastic, Polished
  
Color
Black, Grey, Orange, Pink, White
  
Dark Grey to Black, Pink, Red, White
  
Maintenance
More
  
Less
  
Durability
Durable
  
Durable
  
Water Resistant
Yes
  
No
  
Scratch Resistant
Yes
  
Yes
  
Stain Resistant
Yes
  
Yes
  
Wind Resistant
No
  
Yes
  
Acid Resistant
Yes
  
Yes
  
Appearance
Veined or Pebbled
  
Rough and Dull
  
Architecture
  
  
Interior Uses
Bathrooms, Countertops, Decorative Aggregates, Entryways, Floor Tiles, Flooring, Homes, Hotels, Interior Decoration, Kitchens, Stair Treads
  
Decorative Aggregates, Homes, Interior Decoration
  
Exterior Uses
As Building Stone, As Facing Stone, Office Buildings, Paving Stone, Resorts
  
As Building Stone, Garden Decoration, Office Buildings
  
Other Architectural Uses
Not Yet Used
  
Curbing, Whetstones
  
Industry
  
  
Construction Industry
As Dimension Stone
  
Used for flooring, stair treads, borders and window sills.
  
Medical Industry
Not Yet Used
  
Not Yet Used
  
Antiquity Uses
Artifacts, Monuments, Sculpture, Small Figurines
  
Artifacts, Monuments, Sculpture
  
Other Uses
  
  
Commercial Uses
Cemetery Markers, Commemorative Tablets, Creating Artwork, Curling, Laboratory bench tops, Tombstones
  
Fire resistant, Used to manufracture paperweights and bookends
  
Types
Igneous Protolith Granite, Sedimentary Protolith Granite, Mantle Granite, Anorogenic Granite and Hybrid Granite
  
Not Available
  
Features
Available in Lots of Colors and Patterns, It is One of the Oldest, Strongest and Hardest Rock
  
Is one of the oldest 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
Not Used
  
Used
  
Petroglyphs
Not Used
  
Used
  
Figurines
Used
  
Used
  
Fossils
Absent
  
Present
  
Formation
Granite is an igneous rock which is very hard, crystalline and is visibly homogeneous in texture and forms by melting of continental rocks
  
An argillite is a fine-grained sedimentary rock mainly composed of clay particles which forms from lithified muds which contain variable amounts of silt-sized particles.
  
Composition
  
  
Mineral Content
Amphibole, Biotite, Feldspar, Hornblade, Micas, Muscovite or Illite, Plagioclase, Pyroxene, Quartz
  
Biotite, Chlorite, Feldspar, Micas, Muscovite or Illite, Plagioclase, Pyrite, Quartz
  
Compound Content
Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, MgO, MnO, Sodium Oxide, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide
  
Iron(III) Oxide, Potassium Oxide, MgO, Silicon Dioxide
  
Transformation
  
  
Metamorphism
Yes
  
No
  
Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism
  
Not Applicable
  
Weathering
Yes
  
Yes
  
Types of Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering
  
Biological Weathering
  
Erosion
Yes
  
Yes
  
Types of Erosion
Chemical Erosion, Coastal Erosion, Water Erosion, Wind Erosion
  
Chemical Erosion
  
Physical Properties
  
  
Hardness
6-7
  
2-3
  
Grain Size
Large and Coarse Grained
  
Fine Grained
  
Fracture
Not Available
  
Conchoidal to Uneven
  
Streak
White
  
White to Grey
  
Porosity
Less Porous
  
Highly Porous
  
Luster
Dull to Grainy with Sporadic parts Pearly and Vitreous
  
Waxy and Dull
  
Compressive Strength
175.00 N/mm
2
  
13
Not Available
  
Cleavage
Not Available
  
Slaty
  
Toughness
Not Available
  
2.6
  
Specific Gravity
2.6-2.7
  
2.56-2.68
  
Transparency
Opaque
  
Opaque
  
Density
2.6-2.8 g/cm3
  
2.54-2.66 g/cm3
  
Thermal Properties
  
  
Specific Heat Capacity
0.79 kJ/Kg K
  
16
0.87 kJ/Kg K
  
14
Resistance
Heat Resistant, Wear Resistant
  
Heat Resistant, Impact Resistant
  
Deposits in Eastern Continents
  
  
Asia
China, India, Iran, Saudi Arabia, Sri Lanka, Taiwan, Thailand, Turkey, Vietnam
  
Bangladesh, China, India, Russia
  
Africa
Angola, Egypt, Madagascar, Namibia, Nigeria, South Africa
  
Ethiopia, Kenya, Morocco, South Africa, Tanzania
  
Europe
Austria, Belgium, Finland, France, Germany, Italy, Norway, Sardinia, Spain, Switzerland, The Czech Republic, Venezuela
  
Austria, France, Germany, Greece, Italy, Romania, Scotland, Spain, Switzerland
  
Others
Not Yet Found
  
Not Yet Found
  
Deposits in Western Continents
  
  
North America
Canada, USA
  
USA
  
South America
Not Yet Found
  
Bolivia, Chile, Colombia, Ecuador, Peru, Venezuela
  
Deposits in Oceania Continent
  
  
Australia
Not Yet Found
  
New South Wales, New Zealand, Queensland, Victoria, Western Australia
  
Rapakivi Granite vs Argillite 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. Rapakivi Granite vs Argillite characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Rapakivi Granite and Properties of Argillite. Learn more about Rapakivi Granite vs Argillite in the next section. The interior uses of Rapakivi Granite include Bathrooms, Countertops, Decorative aggregates, Entryways, Floor tiles, Flooring, Homes, Hotels, Interior decoration, Kitchens and Stair treads whereas the interior uses of Argillite include Decorative aggregates, Homes and Interior decoration. Due to some exceptional properties of Rapakivi Granite and Argillite, they have various applications in construction industry. The uses of Rapakivi Granite in construction industry include As dimension stone and that of Argillite include Used for flooring, stair treads, borders and window sills..
More about Rapakivi Granite and Argillite
Here you can know more about Rapakivi Granite and Argillite. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Rapakivi Granite and Argillite consists of mineral content and compound content. The mineral content of Rapakivi Granite includes Amphibole, Biotite, Feldspar, Hornblade, Micas, Muscovite or Illite, Plagioclase, Pyroxene, Quartz and mineral content of Argillite includes Biotite, Chlorite, Feldspar, Micas, Muscovite or Illite, Plagioclase, Pyrite, Quartz. You can also check out the list of all Igneous Rocks. When we have to compare Rapakivi Granite vs Argillite, the texture, color and appearance plays an important role in determining the type of rock. Rapakivi Granite is available in black, grey, orange, pink, white colors whereas, Argillite is available in dark grey to black, pink, red, white colors. Appearance of Rapakivi Granite is Veined or Pebbled and that of Argillite is Rough and Dull. Properties of rock is another aspect for Rapakivi Granite vs Argillite. The hardness of Rapakivi Granite is 6-7 and that of Argillite is 2-3. The types of Rapakivi Granite are Igneous Protolith Granite, Sedimentary Protolith Granite, Mantle Granite, Anorogenic Granite and Hybrid Granite whereas types of Argillite are Not Available. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Rapakivi Granite is white while that of Argillite is white to grey. The specific heat capacity of Rapakivi Granite is 0.79 kJ/Kg K and that of Argillite is 0.87 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Rapakivi Granite is heat resistant, wear resistant whereas Argillite is heat resistant, impact resistant.