Tephrite

Dolomite

Tephrite and Dolomite

Tephrite

Dolomite

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Definition

Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock

Dolomite is a sedimentary rock containing more than 50 percent of the mineral dolomite by weight

History

Origin

Germany

Southern Alps, France

Discoverer

Van Tooren

Dolomieu

Etymology

From Greek tephra, ashes from Indo-European base, to burn

From French, from the name of Dolomieu (1750–1801), the French geologist who discovered the rock

Class

Igneous Rocks

Sedimentary Rocks

Sub-Class

Durable Rock, Hard Rock

Durable Rock, Medium Hardness Rock

Family

Group

Volcanic

Other Categories

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

Texture

Aphanitic to Porphyritic

Earthy

Color

Black, Brown, Green, Grey, White

Black, Brown, Green, Grey, Pink, White

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Vesicular

Glassy or Pearly

Uses

Architecture

Interior Uses

Decorative Aggregates, Flooring, Homes, Interior Decoration

Decorative Aggregates, Homes, Interior Decoration

Exterior Uses

As Building Stone, As Facing Stone, Garden Decoration, Office Buildings

Garden Decoration, Office Buildings

Other Architectural Uses

Curbing

Industry

Construction Industry

Landscaping

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, Cement Manufacture, for Road Aggregate, Making natural cement, Manufacture of Magnesium and Dolomite Refractories, Production of Glass and Ceramics, Serves as an Oil and Gas Reservoir rock

Medical Industry

Taken as a Supplement for Calcium or Magnesium

Antiquity Uses

Artifacts, Sculpture

Artifacts, Jewellery, Monuments, Sculpture, Small Figurines

Other Uses

Commercial Uses

Production of Lime, Soil Conditioner

An Oil and Gas Reservoir, As a Feed Additive for Livestock, Gemstone, Metallurgical Flux, Production of Lime, Soil Conditioner, Source of Magnesia (MgO)

Types

Igneous rock

Boninite and Jasperoid

Features

Host Rock for Lead

Host Rock for Lead, Traps for subsurface fluids like Oil and Natural Gas., Zinc and Copper Deposits

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Present

Formation

Tephrite 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.

Dolomite rocks are originally deposited as calcite or aragonite rich limestone, but during diagenesis process, the calcite or aragonite is transformed into dolomite.

Composition

Mineral Content

Alkali feldspar, Nepheline, Plagioclase, Pyroxene

Clay Minerals, Pyrite, Quartz, Sulfides

Compound Content

CaO, Carbon Dioxide, MgO, Silicon Dioxide

NaCl, CaO, Carbon Dioxide, Magnesium Carbonate, MgO

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Cataclastic Metamorphism, Contact Metamorphism, Impact Metamorphism, Regional Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Coastal Erosion, Glacier Erosion, Sea Erosion, Water Erosion

Properties

Physical Properties

Hardness

6.53.5-4

1 7

👆🏻

Grain Size

Medium to Fine Coarse Grained

Fracture

Uneven

Conchoidal

Streak

Bluish Black

White

Porosity

Very Less Porous

Less Porous

Luster

Subvitreous to Dull

Vitreous and Pearly

Compressive Strength

90.00 N/mm²140.00 N/mm²

0.15 450

👆🏻

Cleavage

Crenulation and Pervasive

Perfect

Toughness

2.4

Specific Gravity

2.862.8-3

0 8.4

👆🏻

Transparency

Opaque

Transparent to Translucent

Density

2.8-2.9 g/cm³2.8-2.9 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.92 kJ/Kg K0.92 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, India

Africa

Namibia, Uganda

Morocco, Namibia

Europe

Germany, Hungary, Italy, Portugal, Spain

Austria, Italy, Romania, Spain, Switzerland

Others

Deposits in Western Continents

North America

USA

Mexico, USA

South America

Brazil, Colombia

Deposits in Oceania Continent

Australia

New Zealand, Western Australia

New South Wales, Queensland, Yorke Peninsula

All about Tephrite and Dolomite Properties

Know all about Tephrite and Dolomite properties here. All properties of rocks are important as they define the type of rock and its application. Tephrite belongs to Igneous Rocks while Dolomite belongs to Sedimentary Rocks.Texture of Tephrite is Aphanitic to Porphyritic whereas that of Dolomite is Earthy. Tephrite appears Vesicular and Dolomite appears Glassy or Pearly. The luster of Tephrite is subvitreous to dull while that of Dolomite is vitreous and pearly. Tephrite is available in black, brown, green, grey, white colors whereas Dolomite is available in black, brown, green, grey, pink, white colors. The commercial uses of Tephrite are production of lime, soil conditioner and that of Dolomite are an oil and gas reservoir, as a feed additive for livestock, gemstone, metallurgical flux, production of lime, soil conditioner, source of magnesia (mgo).