Hornfels

Rhyolite

Hornfels vs Rhyolite

Hornfels

Rhyolite

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1 Definition

1.1 Definition

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

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

1.2 History

1.2.1 Origin

New Zealand

North America

1.2.2 Discoverer

Unknown

Ferdinand von Richthofen

1.3 Etymology

From German which means hornstone

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

1.4 Class

Metamorphic Rocks

Igneous Rocks

1.4.1 Sub-Class

Durable Rock, Soft Rock

Durable Rock, Hard Rock

1.5 Family

1.5.1 Group

Not Applicable

Volcanic

1.6 Other Categories

Fine Grained Rock, Opaque Rock

Coarse Grained Rock, Opaque Rock

2 Texture

2.1 Texture

Granular, Platy

Aphanitic, Glassy, Porphyritic

2.2 Color

Brown, Dark Greenish - Grey, Green, Reddish Brown

Grey, White, Light Black

2.3 Maintenance

Less

2.4 Durability

Durable

2.4.1 Water Resistant

✔ ✘

2.4.2 Scratch Resistant

✔ ✘

2.4.3 Stain Resistant

✔ ✘

2.4.4 Wind Resistant

✔ ✘

2.4.5 Acid Resistant

✔ ✘

2.5 Appearance

Dull

Banded

3 Uses

3.1 Architecture

3.1.1 Interior Uses

Decorative Aggregates, Flooring, Homes, Interior Decoration

Decorative Aggregates, Homes, Hotels, Interior Decoration, Kitchens

3.1.2 Exterior Uses

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

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

3.1.3 Other Architectural Uses

Curbing

Not Yet Used

3.2 Industry

3.2.1 Construction Industry

for Road Aggregate, Roadstone

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

3.2.2 Medical Industry

Not Yet Used

3.3 Antiquity Uses

Artifacts, Monuments

Artifacts

3.4 Other Uses

3.4.1 Commercial Uses

Cemetery Markers, Commemorative Tablets, Creating Artwork

Gemstone, Laboratory bench tops, Jewelry

4 Types

4.1 Types

Biotite hornfels

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

4.2 Features

Smooth to touch

Acidic in nature, Available in lots of colors

4.3 Archaeological Significance

4.3.1 Monuments

Used

Not Yet Used

4.3.2 Famous Monuments

Data Not Available

Not Applicable

4.3.3 Sculpture

Not Yet Used

4.3.4 Famous Sculptures

Not Applicable

4.3.5 Pictographs

Used

Not Used

4.3.6 Petroglyphs

Used

Not Used

4.3.7 Figurines

Not Yet Used

4.4 Fossils

Absent

5 Formation

5.1 Formation

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.

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

5.2 Composition

5.2.1 Mineral Content

Andalusite

Biotite, Feldspar, Hornblade, Plagioclase, Pyroxene, Quartz

5.2.2 Compound Content

Fe, Mg

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

5.3 Transformation

5.3.1 Metamorphism

✔ ✘

5.3.2 Types of Metamorphism

Not Applicable

Burial Metamorphism, Cataclastic Metamorphism, Regional Metamorphism

5.3.3 Weathering

✔ ✘

5.3.4 Types of Weathering

Biological Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

5.3.5 Erosion

✔ ✘

5.3.6 Types of Erosion

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

Chemical Erosion, Sea Erosion, Water Erosion, Wind Erosion

6 Properties

6.1 Physical Properties

6.1.1 Hardness

2-36-7

1 7

6.1.2 Grain Size

Fine Grained

Large and Coarse Grained

6.1.3 Fracture

Conchoidal

Sub-conchoidal

6.1.4 Streak

Unknown

Colorless

6.1.5 Porosity

Highly Porous

6.1.6 Luster

Shiny

Earthy

6.1.7 Compressive Strength

5.80 N/mm²140.00 N/mm²

0.15 450

6.1.8 Cleavage

Perfect

Not Available

6.1.9 Toughness

Not Yet Found

6.1.10 Specific Gravity

3.4-3.92.65-2.67

0 8.4

6.1.11 Transparency

Opaque

6.1.12 Density

0.25-0.30 g/cm³2.4-2.6 g/cm³

0 1400

6.2 Thermal Properties

6.2.1 Specific Heat Capacity

0.84 kJ/Kg KNA

0.14 3.2

6.2.2 Resistance

Heat Resistant, Impact Resistant, Pressure Resistant

Heat Resistant, Wear Resistant

7 Reserves

7.1 Deposits in Eastern Continents

7.1.1 Asia

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

China, India

7.1.2 Africa

Cameroon, East Africa, Tanzania, Western Africa

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

7.1.3 Europe

United Kingdom

Germany, Iceland, Ireland, Italy, Spain

7.1.4 Others

Not Yet Found

7.2 Deposits in Western Continents

7.2.1 North America

Canada, USA

7.2.2 South America

Bolivia, Brazil, Colombia, Ecuador

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

7.3 Deposits in Oceania Continent

7.3.1 Australia

New South Wales, New Zealand, Queensland, Western Australia

New Zealand, Queensland, Western Australia

Hornfels vs Rhyolite 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 Hornfels and Rhyolite Reserves. 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. Rhyolite is a fine-grained igneous rock which is rich in silica. 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 Hornfels vs Rhyolite information and Hornfels vs Rhyolite characteristics in the upcoming sections.

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Hornfels vs Rhyolite 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. Hornfels vs Rhyolite characteristics assist us to distinguish and recognize rocks. Also you can check about Properties of Hornfels and Properties of Rhyolite. Learn more about Hornfels vs Rhyolite in the next section. The interior uses of Hornfels include Decorative aggregates, Flooring, Homes and Interior decoration whereas the interior uses of Rhyolite include Decorative aggregates, Homes, Hotels, Interior decoration and Kitchens. Due to some exceptional properties of Hornfels and Rhyolite, they have various applications in construction industry. The uses of Hornfels in construction industry include For road aggregate, Roadstone and that of Rhyolite include Arrowheads, As dimension stone, Building houses or walls, Construction aggregate, Cutting tool, For road aggregate, Knives.

More about Hornfels and Rhyolite

Here you can know more about Hornfels and Rhyolite. The life cycle of a rock consists of formation of rock, composition of rock and transformation of rock. The composition of Hornfels and Rhyolite consists of mineral content and compound content. The mineral content of Hornfels includes Andalusite and mineral content of Rhyolite includes Biotite, Feldspar, Hornblade, Plagioclase, Pyroxene, Quartz. You can also check out the list of all Metamorphic Rocks. When we have to compare Hornfels vs Rhyolite, the texture, color and appearance plays an important role in determining the type of rock. Hornfels is available in brown, dark greenish - grey, green, reddish brown colors whereas, Rhyolite is available in grey, white, light black colors. Appearance of Hornfels is Dull and that of Rhyolite is Banded. Properties of rock is another aspect for Hornfels vs Rhyolite. The hardness of Hornfels is 2-3 and that of Rhyolite is 6-7. The types of Hornfels are Biotite hornfels whereas types of Rhyolite are Pumice Rocks, Obsidian Rocks, Perlite Rocks, Porphyritic Rocks.. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Hornfels is unknown while that of Rhyolite is colorless. The specific heat capacity of Hornfels is 0.84 kJ/Kg K and that of Rhyolite is Not Available. Depending on the properties like hardness, toughness, specific heat capacity, porosity etc., rocks are resistant to heat, wear, impact, etc.Hornfels is heat resistant, impact resistant, pressure resistant whereas Rhyolite is heat resistant, wear resistant.