Variolite

Dolomite

Variolite and Dolomite

Variolite

Dolomite

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Definition

Variolites are a group of dark green basic igneous rocks which exhibit pale colored spots, or spherules, especially on weathered surfaces, that give them a pockmarked appearance

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

History

Origin

France

Southern Alps, France

Discoverer

Unknown

Dolomieu

Etymology

From Latin varius, speckled, variegated

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

Opaque Rock

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

Texture

Glassy, Massive, Porphyritic, Scoriaceous, Vesicular

Earthy

Color

Black, Brown, Light to Dark Grey

Black, Brown, Green, Grey, Pink, White

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Dull and Soft

Glassy or Pearly

Uses

Architecture

Interior Uses

Floor Tiles, Flooring, Homes, Hotels, Kitchens

Decorative Aggregates, Homes, Interior Decoration

Exterior Uses

Garden Decoration, Office Buildings

Other Architectural Uses

Curbing

Industry

Construction Industry

As Dimension Stone, Cobblestones, Rail Track Ballast, Roadstone

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, Monuments, Sculpture

Artifacts, Jewellery, Monuments, Sculpture, Small Figurines

Other Uses

Commercial Uses

Cemetery Markers, Creating Artwork

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

Types

Metamorphic rock

Boninite and Jasperoid

Features

Has High structural resistance against erosion and climate, Very fine grained rock

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

Variolites are a group of dark green basic igneous rocks that exhibit pale colored spots on weathered surfaces that give them a pockmarked appearance.

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

Olivine, Plagioclase, Pyroxene

Clay Minerals, Pyrite, Quartz, Sulfides

Compound Content

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

NaCl, CaO, Carbon Dioxide, Magnesium Carbonate, MgO

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal 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

Properties

Physical Properties

Hardness

63.5-4

1 7

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Grain Size

Medium to Fine Coarse Grained

Fracture

Conchoidal

Streak

White to Grey

White

Porosity

Less Porous

Luster

Vitreous and Pearly

Compressive Strength

37.50 N/mm²140.00 N/mm²

0.15 450

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Cleavage

Perfect

Toughness

2.3

Specific Gravity

2.8-32.8-3

0 8.4

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Transparency

Opaque

Transparent to Translucent

Density

2.9-3.1 g/cm³2.8-2.9 g/cm³

0 1400

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Thermal Properties

Specific Heat Capacity

0.84 kJ/Kg K0.92 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

India, Russia

China, India

Africa

South Africa

Morocco, Namibia

Europe

Iceland

Austria, Italy, Romania, Spain, Switzerland

Others

Deposits in Western Continents

North America

Canada, USA

Mexico, USA

South America

Brazil

Brazil, Colombia

Deposits in Oceania Continent

Australia

New South Wales, Queensland, Yorke Peninsula

All about Variolite and Dolomite Properties

Know all about Variolite and Dolomite properties here. All properties of rocks are important as they define the type of rock and its application. Variolite belongs to Igneous Rocks while Dolomite belongs to Sedimentary Rocks.Texture of Variolite is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular whereas that of Dolomite is Earthy. Variolite appears Dull and Soft and Dolomite appears Glassy or Pearly. The luster of Variolite is while that of Dolomite is vitreous and pearly. Variolite is available in black, brown, light to dark grey colors whereas Dolomite is available in black, brown, green, grey, pink, white colors. The commercial uses of Variolite are cemetery markers, creating artwork 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).