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Phyllite
Phyllite

Obsidian
Obsidian



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Phyllite
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Obsidian

Phyllite vs Obsidian

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Definition

Definition

Phyllite is a fine-grained metamorphic rock with a well-developed laminar structure, and is intermediate between slate and schist rocks
Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly with minimum crystal growth

History

Origin

-
Ethiopia

Discoverer

Unknown
Obsius

Etymology

From Greek phullon leaf + -ite1
From Latin obsidianus, misprint of Obsianus (lapis) (stone) of Obsius

Class

Metamorphic Rocks
Igneous Rocks

Sub-Class

Durable Rock, Soft Rock
Durable Rock, Medium Hardness Rock

Family

Group

-
Volcanic

Other Categories

Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Opaque Rock

Texture

Texture

Phyllitic Sheen, Slaty
Glassy

Color

Black to Grey, Light Greenish Grey
Black, Blue, Brown, Green, Orange, Red, Tan, Yellow

Maintenance

More
Less

Durability

Durable
Durable

Water Resistant

Scratch Resistant

Stain Resistant

Wind Resistant

Acid Resistant

Appearance

Crinkled or Wavy
Shiny

Uses

Architecture

Interior Uses

Decorative Aggregates, Floor Tiles, Homes, Interior Decoration
Decorative Aggregates, Interior Decoration

Exterior Uses

As Building Stone, As Facing Stone, Garden Decoration
Garden Decoration

Other Architectural Uses

Curbing
-

Industry

Construction Industry

As Dimension Stone, Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate, Raw material for the manufacture of mortar, Roadstone
Arrowheads, Cutting Tool, Knives, Scrapers, Spear Points

Medical Industry

-
Surgery

Antiquity Uses

Artifacts, Sculpture
Artifacts, Jewellery

Other Uses

Commercial Uses

Cemetery Markers, Commemorative Tablets, Creating Artwork, Writing Slates
Creating Artwork, Mirror, Used in aquariums

Types

Types

Phyllite
Fireworks Obsidian, Mahogany, Sheen Obsidian, Snowflake obsidian and Velvet Peacock Obsidian

Features

Easily splits into thin plates, Is one of the oldest rock, Surfaces are often shiny
Blocks negativity, Helps to protect against depression

Archaeological Significance

Monuments

-
-

Famous Monuments

-
-

Sculpture

-
-

Famous Sculptures

-
-

Pictographs

-
-

Petroglyphs

-
-

Figurines

-
-

Fossils

Absent
Absent

Formation

Formation

Phyllite is a metamorphic rock which is formed by regional metamorphism of argillaceous sediments since their cleavage arose due to deviatoric stress.
When the lava is released from volcano, it undergoes a very rapid cooling which freezes the mechanisms of crystallization. The result is a volcanic glass with a uniform smooth texture.

Composition

Mineral Content

Albite, Alusite, Amphibole, Apatite, Biotite, Chlorite, Epidote, Feldspar, Garnet, Graphite, Hornblade, Kyanite, Micas, Muscovite or Illite, Porphyroblasts, Quartz, Sillimanite, Staurolite, Talc, Zircon
-

Compound Content

CaO, Carbon Dioxide, MgO
Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, MgO, MnO, Sodium Oxide, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide

Transformation

Metamorphism

Types of Metamorphism

-
Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism

Weathering

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering
Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

Types of Erosion

Chemical Erosion, Coastal Erosion, Glacier Erosion, Water Erosion, Wind Erosion
Chemical Erosion, Coastal Erosion, Glacier Erosion

Properties

Physical Properties

Hardness

1-25-5.5
1 7
👆🏻

Grain Size

Medium to Fine Coarse Grained
-

Fracture

Conchoidal
Conchoidal

Streak

White
White

Porosity

Highly Porous
Very Less Porous

Luster

Phyllitic
Vitreous

Compressive Strength

50.00 N/mm20.15 N/mm2
0.15 450
👆🏻

Cleavage

Crenulation and Pervasive
-

Toughness

1.2
-

Specific Gravity

2.72-2.732.6-2.7
0 8.4
👆🏻

Transparency

Opaque
Translucent

Density

2.18-3.3 g/cm32.6 g/cm3
0 1400
👆🏻

Thermal Properties

Specific Heat Capacity

0.79 kJ/Kg K0.92 kJ/Kg K
0.14 3.2
👆🏻

Resistance

Heat Resistant, Pressure Resistant, Water Resistant
Heat Resistant, Impact Resistant

Reserves

Deposits in Eastern Continents

Asia

Afghanistan, Bangladesh, Bhutan, China, India, Japan, Kazakhstan, Malaysia, Pakistan, Russia, Thailand, Turkey, Vietnam
Afghanistan, Indonesia, Japan, Russia

Africa

Egypt, Ethiopia, Morocco, Nigeria, South Africa
Kenya

Europe

Austria, England, France, Georgia, Germany, Italy, Liechtenstein, Monaco, Norway, Slovenia, Spain, Sweden, Switzerland
Greece, Hungary, Iceland, Italy, Turkey

Others

-
-

Deposits in Western Continents

North America

Canada, Costa Rica, Cuba, Mexico, Panama, USA
Canada, Mexico, USA

South America

Brazil, Colombia, Guyana
Argentina, Chile, Ecuador, Peru

Deposits in Oceania Continent

Australia

New South Wales, New Zealand, Queensland
New Zealand

Phyllite vs Obsidian Information

Earth’s outer layer is covered by rocks and these rocks have different physical and chemical properties. As two rocks are not same, it’s fun to compare them. You can also know more about Phyllite and Obsidian Reserves. Phyllite is a fine-grained metamorphic rock with a well-developed laminar structure, and is intermediate between slate and schist rocks. Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly with minimum crystal growth. These rocks are composed of many distinct minerals. The process of formation of rocks is different for various rocks. Rocks are quarried from many years for various purposes. You can check out Phyllite vs Obsidian information and Phyllite vs Obsidian characteristics in the upcoming sections.

Phyllite vs Obsidian 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. Phyllite vs Obsidian characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Phyllite and Properties of Obsidian. Learn more about Phyllite vs Obsidian in the next section. The interior uses of Phyllite include Decorative aggregates, Floor tiles, Homes and Interior decoration whereas the interior uses of Obsidian include Decorative aggregates and Interior decoration. Due to some exceptional properties of Phyllite and Obsidian, they have various applications in construction industry. The uses of Phyllite in construction industry include As dimension stone, Building houses or walls, Cement manufacture, Construction aggregate, For road aggregate, Raw material for the manufacture of mortar, Roadstone and that of Obsidian include Arrowheads, Cutting tool, Knives, Scrapers, Spear points.

More about Phyllite and Obsidian

Here you can know more about Phyllite and Obsidian. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Phyllite and Obsidian consists of mineral content and compound content. The mineral content of Phyllite includes Albite, Alusite, Amphibole, Apatite, Biotite, Chlorite, Epidote, Feldspar, Garnet, Graphite, Hornblade, Kyanite, Micas, Muscovite or Illite, Porphyroblasts, Quartz, Sillimanite, Staurolite, Talc, Zircon and mineral content of Obsidian includes . You can also check out the list of all Metamorphic Rocks. When we have to compare Phyllite vs Obsidian, the texture, color and appearance plays an important role in determining the type of rock. Phyllite is available in black to grey, light greenish grey colors whereas, Obsidian is available in black, blue, brown, green, orange, red, tan, yellow colors. Appearance of Phyllite is Crinkled or Wavy and that of Obsidian is Shiny. Properties of rock is another aspect for Phyllite vs Obsidian. The hardness of Phyllite is 1-2 and that of Obsidian is 5-5.5. The types of Phyllite are Phyllite whereas types of Obsidian are Fireworks Obsidian, Mahogany, Sheen Obsidian, Snowflake obsidian and Velvet Peacock Obsidian. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Phyllite and Obsidian is white. The specific heat capacity of Phyllite is 0.79 kJ/Kg K and that of Obsidian is 0.92 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Phyllite is heat resistant, pressure resistant, water resistant whereas Obsidian is heat resistant, impact resistant.