Comendite

Rhyolite

Comendite and Rhyolite

Comendite

Rhyolite

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Definition

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

Rhyolite is a fine-grained igneous rock which is rich in silica

History

Origin

Italy

North America

Discoverer

Unknown

Ferdinand von Richthofen

Etymology

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

From German Rhyolit, from Greek rhuax lava stream + lithos stone

Class

Igneous Rocks

Sub-Class

Durable Rock, Hard Rock

Family

Group

Volcanic

Other Categories

Medium Grained Rock, Opaque Rock

Coarse Grained Rock, Opaque Rock

Texture

Porphyritic

Aphanitic, Glassy, Porphyritic

Color

Blue, Bluish - Grey

Grey, White, Light Black

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Foliated

Banded

Uses

Architecture

Interior Uses

Countertops, Decorative Aggregates, Interior Decoration

Decorative Aggregates, Homes, Hotels, Interior Decoration, Kitchens

Exterior Uses

As Building Stone, As Facing Stone, Garden Decoration

As Building Stone, As Facing Stone, Paving Stone, Office Buildings

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

Arrowheads, As Dimension Stone, Building houses or walls, Construction Aggregate, Cutting Tool, for Road Aggregate, Knives

Medical Industry

Antiquity Uses

Artifacts

Other Uses

Commercial Uses

Cemetery Markers

Gemstone, Laboratory bench tops, Jewelry

Types

Rhyolite

Pumice Rocks, Obsidian Rocks, Perlite Rocks, Porphyritic Rocks.

Features

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

Acidic in nature, Available in lots of colors

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.

Rhyolite is a felsic extrusive rock and due to its high silica content, rhyolite lava is very viscous and is volcanic equivalent of granite.

Composition

Mineral Content

Albite, Amphibole, Quartz

Biotite, Feldspar, Hornblade, Plagioclase, Pyroxene, Quartz

Compound Content

Al, Fe, Potassium Oxide

Ca, Fe, Potassium Oxide, Mg, Potassium, Silicon Dioxide, Sodium

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Cataclastic Metamorphism, Regional Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Regional Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Coastal Erosion, Water Erosion

Chemical Erosion, Sea Erosion, Water Erosion, Wind Erosion

Properties

Physical Properties

Hardness

6-76-7

1 7

👆🏻

Grain Size

Medium Grained

Large and Coarse Grained

Fracture

Pervasive

Sub-conchoidal

Streak

Bluish Black

Porosity

Highly Porous

Luster

Dull

Earthy

Compressive Strength

92.40 N/mm²140.00 N/mm²

0.15 450

👆🏻

Cleavage

Toughness

Specific Gravity

2.382.65-2.67

0 8.4

👆🏻

Transparency

Opaque

Density

-9999 g/cm³2.4-2.6 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.79 kJ/Kg K0.71 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Impact Resistant

Heat Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

China

China, India

Africa

East Africa

Angola, Egypt, Madagascar, Namibia, Nigeria, South Africa

Europe

Italy

Germany, Iceland, Ireland, Italy, Spain

Others

Deposits in Western Continents

North America

Canada, USA

South America

Argentina, Bolivia, Chile, Colombia, Ecuador, Peru, Venezuela

Deposits in Oceania Continent

Australia

Queensland

New Zealand, Queensland, Western Australia

All about Comendite and Rhyolite Properties

Know all about Comendite and Rhyolite properties here. All properties of rocks are important as they define the type of rock and its application. Comendite and Rhyolite belong to Igneous Rocks.Texture of Comendite is Porphyritic whereas that of Rhyolite is Aphanitic, Glassy, Porphyritic. Comendite appears Foliated and Rhyolite appears Banded. The luster of Comendite is dull while that of Rhyolite is earthy. Comendite is available in blue, bluish - grey colors whereas Rhyolite is available in grey, white, light black colors. The commercial uses of Comendite are cemetery markers and that of Rhyolite are gemstone, laboratory bench tops, jewelry.