Comendite

Skarn

Comendite and Skarn

Comendite

Skarn

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Definition

Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite

Skarns are formed during regional or contact metamorphism and from a variety of metasomatic processes involving fluids of magmatic, metamorphic, and/or marine origin

History

Origin

Italy

USA, Australia

Discoverer

Unknown

Tornebohm

Etymology

Comendite derives its name from the area of Le Commende on San Pietro Island in Italy

From an old Swedish mining term originally used to describe a type of silicate gangue or waste rock.

Class

Igneous Rocks

Metamorphic Rocks

Sub-Class

Durable Rock, Hard Rock

Family

Group

Volcanic

Other Categories

Medium Grained Rock, Opaque Rock

Fine Grained Rock, Opaque Rock

Texture

Porphyritic

Earthy, Mud-rich, Rough

Color

Blue, Bluish - Grey

Black, Brown, Green, Grey, White

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Foliated

Dull

Uses

Architecture

Interior Uses

Countertops, Decorative Aggregates, Interior Decoration

Decorative Aggregates, Entryways, Interior Decoration

Exterior Uses

As Building Stone, As Facing Stone, Garden Decoration

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

Other Architectural Uses

Curbing

Industry

Construction Industry

Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate, Landscaping, Making natural cement, Raw material for the manufacture of mortar

As a Flux in the Production of Steel and Pig Iron, As a Sintering Agent in Steel Industry to process Iron Ore, As Dimension Stone, Gold and Silver production, Manufacture of Magnesium and Dolomite Refractories

Medical Industry

Antiquity Uses

Artifacts

Artifacts, Monuments, Sculpture

Other Uses

Commercial Uses

Cemetery Markers

Creating Artwork, Gemstone, Jewelry, Metallurgical Flux, Source of Magnesia (MgO)

Types

Rhyolite

Endoskarns

Features

Very fine grained rock, It is One of the Oldest, Strongest and Hardest Rock

Host Rock for Lead, Zinc and Copper Deposits

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

Comendite is a type of Igneous rock which is formed due to cooling and solidification of lava or magma. It may form with or without crystallization, either below the surface as intrusive rocks or on the surface as extrusive rocks.

Due to change in environmental conditions, rocks are heated and pressurized deep inside the Earth's surface. Skarn is formed from the extreme heat caused by magma or by the intense collisions and friction of tectonic plates.

Composition

Mineral Content

Albite, Amphibole, Quartz

Calcite, Enstatite, Epidote, Garnet, Magnetite, Pyroxene, Titanite

Compound Content

Al, Fe, Potassium Oxide

Au, CaO, Carbon Dioxide, Cu, Fe, MgO

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Cataclastic Metamorphism, Regional Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Coastal Erosion, Water Erosion

Properties

Physical Properties

Hardness

6-76.5

1 7

👆🏻

Grain Size

Medium Grained

Fine Grained

Fracture

Pervasive

Irregular

Streak

Bluish Black

Light to dark brown

Porosity

Highly Porous

Less Porous

Luster

Dull

Waxy and Dull

Compressive Strength

92.40 N/mm²70.00 N/mm²

0.15 450

👆🏻

Cleavage

Slaty

Toughness

2.4

Specific Gravity

2.382.86

0 8.4

👆🏻

Transparency

Opaque

Density

-9999 g/cm³2.8-2.9 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, Impact Resistant

Heat Resistant

Reserves

Deposits in Eastern Continents

Asia

China

China, India, Russia, Saudi Arabia, South Korea, Sri Lanka

Africa

East Africa

South Africa, Western Africa

Europe

Italy

United Kingdom

Others

Deposits in Western Continents

North America

Canada

South America

Brazil, Colombia, Paraguay

Deposits in Oceania Continent

Australia

Queensland

Central Australia, Western Australia

All about Comendite and Skarn Properties

Know all about Comendite and Skarn properties here. All properties of rocks are important as they define the type of rock and its application. Comendite belongs to Igneous Rocks while Skarn belongs to Metamorphic Rocks.Texture of Comendite is Porphyritic whereas that of Skarn is Earthy, Mud-rich, Rough. Comendite appears Foliated and Skarn appears Dull. The luster of Comendite is dull while that of Skarn is waxy and dull. Comendite is available in blue, bluish - grey colors whereas Skarn is available in black, brown, green, grey, white colors. The commercial uses of Comendite are cemetery markers and that of Skarn are creating artwork, gemstone, jewelry, metallurgical flux, source of magnesia (mgo).