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Dolomite
Dolomite

Hornfels
Hornfels



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Dolomite vs Hornfels

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Definition

Definition

Dolomite is a sedimentary rock containing more than 50 percent of the mineral dolomite by weight
Hornfels is a metamorphic rock formed by the contact between mudstone or other clay rich rock, and a hot igneous body, and represents a heat altered equivalent of the original rock

History

Origin

Southern Alps, France
New Zealand

Discoverer

Dolomieu
Unknown

Etymology

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

Class

Sedimentary Rocks
Metamorphic Rocks

Sub-Class

Durable Rock, Medium Hardness Rock
Durable Rock, Soft Rock

Family

Group

-
-

Other Categories

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

Texture

Texture

Earthy
Granular, Platy

Color

Black, Brown, Green, Grey, Pink, White
Brown, Dark Greenish - Grey, Green, Reddish Brown

Maintenance

Less
Less

Durability

Durable
Durable

Water Resistant

Scratch Resistant

Stain Resistant

Wind Resistant

Acid Resistant

Appearance

Glassy or Pearly
Dull

Uses

Architecture

Interior Uses

Decorative Aggregates, Homes, Interior Decoration
Decorative Aggregates, Flooring, Homes, Interior Decoration

Exterior Uses

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

Other Architectural Uses

-
Curbing

Industry

Construction Industry

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
for Road Aggregate, Roadstone

Medical Industry

Taken as a Supplement for Calcium or Magnesium
-

Antiquity Uses

Artifacts, Jewellery, Monuments, Sculpture, Small Figurines
Artifacts, Monuments

Other Uses

Commercial Uses

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

Types

Types

Boninite and Jasperoid
Biotite hornfels

Features

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

Archaeological Significance

Monuments

-
-

Famous Monuments

-
-

Sculpture

-
-

Famous Sculptures

-
-

Pictographs

-
-

Petroglyphs

-
-

Figurines

-
-

Fossils

Present
Absent

Formation

Formation

Dolomite rocks are originally deposited as calcite or aragonite rich limestone, but during diagenesis process, the calcite or aragonite is transformed into dolomite.
Due to change in environmental conditions, rocks are heated and pressurized deep inside the Earth's surface. Hornfels is formed from the extreme heat caused by magma or by the intense collisions and friction of tectonic plates.

Composition

Mineral Content

Clay Minerals, Pyrite, Quartz, Sulfides
Andalusite

Compound Content

NaCl, CaO, Carbon Dioxide, Magnesium Carbonate, MgO
Fe, Mg

Transformation

Metamorphism

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism
-

Weathering

Types of Weathering

-
Biological Weathering

Erosion

Types of Erosion

-
Chemical Erosion, Glacier Erosion, Sea Erosion, Water Erosion, Wind Erosion

Properties

Physical Properties

Hardness

3.5-42-3
1 7
👆🏻

Grain Size

Medium to Fine Coarse Grained
Fine Grained

Fracture

Conchoidal
Conchoidal

Streak

White
-

Porosity

Less Porous
Highly Porous

Luster

Vitreous and Pearly
Shiny

Compressive Strength

140.00 N/mm25.80 N/mm2
0.15 450
👆🏻

Cleavage

Perfect
Perfect

Toughness

1
-

Specific Gravity

2.8-33.4-3.9
0 8.4
👆🏻

Transparency

Transparent to Translucent
Opaque

Density

2.8-2.9 g/cm30.25-0.30 g/cm3
0 1400
👆🏻

Thermal Properties

Specific Heat Capacity

0.92 kJ/Kg K0.84 kJ/Kg K
0.14 3.2
👆🏻

Resistance

Heat Resistant, Pressure Resistant, Wear Resistant
Heat Resistant, Impact Resistant, Pressure Resistant

Reserves

Deposits in Eastern Continents

Asia

China, India
Bangladesh, Bhutan, China, India, North Korea, Qatar, Russia, Saudi Arabia, South Korea, Thailand

Africa

Morocco, Namibia
Cameroon, East Africa, Tanzania, Western Africa

Europe

Austria, Italy, Romania, Spain, Switzerland
United Kingdom

Others

-
-

Deposits in Western Continents

North America

Mexico, USA
Canada, USA

South America

Brazil, Colombia
Bolivia, Brazil, Colombia, Ecuador

Deposits in Oceania Continent

Australia

New South Wales, Queensland, Yorke Peninsula
New South Wales, New Zealand, Queensland, Western Australia

Dolomite vs Hornfels Information

Earth’s outer layer is covered by rocks and these rocks have different physical and chemical properties. As two rocks are not same, it’s fun to compare them. You can also know more about Dolomite and Hornfels Reserves. Dolomite is a sedimentary rock containing more than 50 percent of the mineral dolomite by weight. Hornfels is a metamorphic rock formed by the contact between mudstone or other clay rich rock, and a hot igneous body, and represents a heat altered equivalent of the original rock. These rocks are composed of many distinct minerals. The process of formation of rocks is different for various rocks. Rocks are quarried from many years for various purposes. You can check out Dolomite vs Hornfels information and Dolomite vs Hornfels characteristics in the upcoming sections.

Dolomite vs Hornfels Characteristics

Though some rocks look identical, they have certain characteristics which distinguish them from others. Characteristics of rocks include texture, appearance, color, fracture, streak, hardness etc. Dolomite vs Hornfels characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Dolomite and Properties of Hornfels. Learn more about Dolomite vs Hornfels in the next section. The interior uses of Dolomite include Decorative aggregates, Homes and Interior decoration whereas the interior uses of Hornfels include Decorative aggregates, Flooring, Homes and Interior decoration. Due to some exceptional properties of Dolomite and Hornfels, they have various applications in construction industry. The uses of Dolomite in construction industry include 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 and that of Hornfels include For road aggregate, Roadstone.

More about Dolomite and Hornfels

Here you can know more about Dolomite and Hornfels. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Dolomite and Hornfels consists of mineral content and compound content. The mineral content of Dolomite includes Clay Minerals, Pyrite, Quartz, Sulfides and mineral content of Hornfels includes Andalusite. You can also check out the list of all Sedimentary Rocks. When we have to compare Dolomite vs Hornfels, the texture, color and appearance plays an important role in determining the type of rock. Dolomite is available in black, brown, green, grey, pink, white colors whereas, Hornfels is available in brown, dark greenish - grey, green, reddish brown colors. Appearance of Dolomite is Glassy or Pearly and that of Hornfels is Dull. Properties of rock is another aspect for Dolomite vs Hornfels. The hardness of Dolomite is 3.5-4 and that of Hornfels is 2-3. The types of Dolomite are Boninite and Jasperoid whereas types of Hornfels are Biotite hornfels. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Dolomite is white while that of Hornfels is . The specific heat capacity of Dolomite is 0.92 kJ/Kg K and that of Hornfels is 0.84 kJ/Kg K. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Dolomite is heat resistant, pressure resistant, wear resistant whereas Hornfels is heat resistant, impact resistant, pressure resistant.