Hornfels

Rhyolite

Hornfels and Rhyolite

Hornfels

Rhyolite

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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

History

Origin

New Zealand

North America

Discoverer

Unknown

Ferdinand von Richthofen

Etymology

From German which means hornstone

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

Class

Metamorphic Rocks

Igneous Rocks

Sub-Class

Durable Rock, Soft Rock

Durable Rock, Hard Rock

Family

Group

Volcanic

Other Categories

Fine Grained Rock, Opaque Rock

Coarse Grained Rock, Opaque Rock

Texture

Granular, Platy

Aphanitic, Glassy, Porphyritic

Color

Brown, Dark Greenish - Grey, Green, Reddish Brown

Grey, White, Light Black

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Dull

Banded

Uses

Architecture

Interior Uses

Decorative Aggregates, Flooring, Homes, Interior Decoration

Decorative Aggregates, Homes, Hotels, Interior Decoration, Kitchens

Exterior Uses

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

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

Other Architectural Uses

Curbing

Industry

Construction Industry

for Road Aggregate, Roadstone

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

Medical Industry

Antiquity Uses

Artifacts, Monuments

Artifacts

Other Uses

Commercial Uses

Cemetery Markers, Commemorative Tablets, Creating Artwork

Gemstone, Laboratory bench tops, Jewelry

Types

Biotite hornfels

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

Features

Smooth to touch

Acidic in nature, Available in lots of colors

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

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.

Composition

Mineral Content

Andalusite

Biotite, Feldspar, Hornblade, Plagioclase, Pyroxene, Quartz

Compound Content

Fe, Mg

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

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Regional Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

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

Chemical Erosion, Sea Erosion, Water Erosion, Wind Erosion

Properties

Physical Properties

Hardness

2-36-7

1 7

👆🏻

Grain Size

Fine Grained

Large and Coarse Grained

Fracture

Conchoidal

Sub-conchoidal

Streak

Porosity

Highly Porous

Luster

Shiny

Earthy

Compressive Strength

5.80 N/mm²140.00 N/mm²

0.15 450

👆🏻

Cleavage

Perfect

Toughness

Specific Gravity

3.4-3.92.65-2.67

0 8.4

👆🏻

Transparency

Opaque

Density

0.25-0.30 g/cm³2.4-2.6 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.84 kJ/Kg K0.71 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Impact Resistant, Pressure Resistant

Heat Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

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

China, India

Africa

Cameroon, East Africa, Tanzania, Western Africa

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

Europe

United Kingdom

Germany, Iceland, Ireland, Italy, Spain

Others

Deposits in Western Continents

North America

Canada, USA

South America

Bolivia, Brazil, Colombia, Ecuador

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

Deposits in Oceania Continent

Australia

New South Wales, New Zealand, Queensland, Western Australia

New Zealand, Queensland, Western Australia

All about Hornfels and Rhyolite Properties

Know all about Hornfels and Rhyolite properties here. All properties of rocks are important as they define the type of rock and its application. Hornfels belongs to Metamorphic Rocks while Rhyolite belongs to Igneous Rocks.Texture of Hornfels is Granular, Platy whereas that of Rhyolite is Aphanitic, Glassy, Porphyritic. Hornfels appears Dull and Rhyolite appears Banded. The luster of Hornfels is shiny while that of Rhyolite is earthy. Hornfels is available in brown, dark greenish - grey, green, reddish brown colors whereas Rhyolite is available in grey, white, light black colors. The commercial uses of Hornfels are cemetery markers, commemorative tablets, creating artwork and that of Rhyolite are gemstone, laboratory bench tops, jewelry.