Comendite

Hornblendite

Comendite and Hornblendite

Comendite

Hornblendite

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Definition

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

Hornblendite is a type of igneous plutonic rock consisting mainly of amphibole hornblende and is a type of Amphibolite rock

History

Origin

Italy

Discoverer

Unknown

Etymology

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

From German, Horn horn + blende

Class

Igneous Rocks

Sub-Class

Durable Rock, Hard Rock

Family

Group

Volcanic

Plutonic

Other Categories

Medium Grained Rock, Opaque Rock

Coarse Grained Rock, Medium Grained Rock, Opaque Rock

Texture

Porphyritic

Banded, Foliated, Massive

Color

Blue, Bluish - Grey

Black, Brown, Green, Grey

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Foliated

Uses

Architecture

Interior Uses

Countertops, Decorative Aggregates, Interior Decoration

Countertops, Decorative Aggregates, Entryways, Flooring, Homes, Hotels, Interior Decoration, Kitchens

Exterior Uses

As Building Stone, As Facing Stone, Garden Decoration

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

As Dimension Stone, Building houses or walls, Cobblestones, Construction Aggregate, for Road Aggregate, Landscaping, Production of Glass and Ceramics, Roadstone

Medical Industry

Antiquity Uses

Artifacts

Artifacts, Sculpture, Small Figurines

Other Uses

Commercial Uses

Cemetery Markers

Cemetery Markers, Commemorative Tablets, Creating Artwork

Types

Rhyolite

Hornblende Gabbro and Hornblende Peridotite

Features

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

Clasts are smooth to touch, Matrix variable, Surfaces are often shiny

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.

Hornblendite is a fine-grained, hard rock which is a type of metasomatite, essentially altered basalt. It forms with or without crystallization, either below the surface as intrusive rocks or on the surface as extrusive rocks.

Composition

Mineral Content

Albite, Amphibole, Quartz

Amphibole, Calcite, Hornblade, Magnetite, Plagioclase, Wollastonite

Compound Content

Al, Fe, Potassium Oxide

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

Transformation

Metamorphism

✔ ✘

Types of 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, Water Erosion, Wind Erosion

Properties

Physical Properties

Hardness

6-76-7

1 7

👆🏻

Grain Size

Medium Grained

Medium to Coarse Grained

Fracture

Pervasive

Irregular to Conchoidal

Streak

Bluish Black

White to Grey

Porosity

Highly Porous

Less Porous

Luster

Dull

Vitreous to Dull

Compressive Strength

92.40 N/mm²250.00 N/mm²

0.15 450

👆🏻

Cleavage

Toughness

2.3

Specific Gravity

2.382.5

0 8.4

👆🏻

Transparency

Opaque

Density

-9999 g/cm³2.85-3.07 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.79 kJ/Kg K0.84 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Impact Resistant

Heat Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

China

Russia, Turkey

Africa

East Africa

Burundi, Djibouti, Eritrea, Ethiopia, Kenya, Madagascar, Rwanda, Somalia, South Africa, Sudan, Tanzania, Uganda

Europe

Italy

Germany, Greece, Iceland, Norway, Poland

Others

Deposits in Western Continents

North America

Canada, USA

South America

Brazil

Deposits in Oceania Continent

Australia

Queensland

South Australia, Western Australia

All about Comendite and Hornblendite Properties

Know all about Comendite and Hornblendite properties here. All properties of rocks are important as they define the type of rock and its application. Comendite and Hornblendite belong to Igneous Rocks.Texture of Comendite is Porphyritic whereas that of Hornblendite is Banded, Foliated, Massive. Comendite appears Foliated and Hornblendite appears Foliated. The luster of Comendite is dull while that of Hornblendite is vitreous to dull. Comendite is available in blue, bluish - grey colors whereas Hornblendite is available in black, brown, green, grey colors. The commercial uses of Comendite are cemetery markers and that of Hornblendite are cemetery markers, commemorative tablets, creating artwork.