Rhyolite

Lamprophyre

Rhyolite and Lamprophyre

Rhyolite

Lamprophyre

Add ⊕

Definition

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

Lamprophyre is uncommon igneous rocks primarily occurring as dikes, lopoliths, laccoliths, stocks and small intrusions

History

Origin

North America

Discoverer

Ferdinand von Richthofen

Unknown

Etymology

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

From Greek lampros bright and shining + porphureos purple

Class

Igneous Rocks

Sub-Class

Durable Rock, Hard Rock

Durable Rock, Medium Hardness Rock

Family

Group

Volcanic

Plutonic

Other Categories

Coarse Grained Rock, Opaque Rock

Coarse Grained Rock, Fine Grained Rock, Opaque Rock

Texture

Aphanitic, Glassy, Porphyritic

Porphyritic

Color

Grey, White, Light Black

Black, Bluish - Grey, Brown, Dark Greenish - Grey, Green, Grey

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Banded

Dull, Banded and Foilated

Uses

Architecture

Interior Uses

Decorative Aggregates, Homes, Hotels, Interior Decoration, Kitchens

Decorative Aggregates, Interior Decoration

Exterior Uses

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

As Building Stone, Office Buildings

Other Architectural Uses

Curbing

Industry

Construction Industry

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

As Dimension Stone, Cement Manufacture, for Road Aggregate, Making natural cement, Manufacture of Magnesium and Dolomite Refractories

Medical Industry

Taken as a Supplement for Calcium or Magnesium

Antiquity Uses

Artifacts

Artifacts, Monuments, Sculpture

Other Uses

Commercial Uses

Gemstone, Laboratory bench tops, Jewelry

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

Types

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

Minette, Alnoite, Camptonite, Monchiquite, Fourchite, Vogesite, Appinite and Spessartite

Features

Acidic in nature, Available in lots of colors

Always found as volcanic pipes over deep continental crust, Host rock for Diamond, Is one of the oldest rock, Surfaces are often shiny

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

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

Lamprophyre formation takes place deep beneath the Earth’s surface at around 150 to 450 kilometres, and are erupted rapidly and violently.

Composition

Mineral Content

Biotite, Feldspar, Hornblade, Plagioclase, Pyroxene, Quartz

Amphibole, Carbonate, Garnet, Micas, Olivine, Phlogopite, Pyroxene

Compound Content

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

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

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Regional Metamorphism

Cataclastic Metamorphism, Impact Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Biological Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion, Sea Erosion, Water Erosion, Wind Erosion

Chemical Erosion, Water Erosion, Wind Erosion

Properties

Physical Properties

Hardness

6-75-6

1 7

👆🏻

Grain Size

Large and Coarse Grained

Fine to Coarse Grained

Fracture

Sub-conchoidal

Conchoidal

Streak

White

Porosity

Highly Porous

Very Less Porous

Luster

Earthy

Subvitreous to Dull

Compressive Strength

140.00 N/mm²120.00 N/mm²

0.15 450

👆🏻

Cleavage

Conchoidal

Toughness

Specific Gravity

2.65-2.672.86-2.87

0 8.4

👆🏻

Transparency

Opaque

Translucent to Opaque

Density

2.4-2.6 g/cm³2.95-2.96 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.71 kJ/Kg K0.84 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Wear Resistant

Heat Resistant, Impact Resistant

Reserves

Deposits in Eastern Continents

Asia

China, India

Russia

Africa

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

Angola, Botswana, Cameroon, Ethiopia, South Africa

Europe

Germany, Iceland, Ireland, Italy, Spain

England, Hungary, Iceland, United Kingdom

Others

Antarctica, Greenland

Deposits in Western Continents

North America

Canada, USA

Canada, Mexico, USA

South America

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

Argentina, Colombia, Ecuador

Deposits in Oceania Continent

Australia

New Zealand, Queensland, Western Australia

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

All about Rhyolite and Lamprophyre Properties

Know all about Rhyolite and Lamprophyre properties here. All properties of rocks are important as they define the type of rock and its application. Rhyolite and Lamprophyre belong to Igneous Rocks.Texture of Rhyolite is Aphanitic, Glassy, Porphyritic whereas that of Lamprophyre is Porphyritic. Rhyolite appears Banded and Lamprophyre appears Dull, Banded and Foilated. The luster of Rhyolite is earthy while that of Lamprophyre is subvitreous to dull. Rhyolite is available in grey, white, light black colors whereas Lamprophyre is available in black, bluish - grey, brown, dark greenish - grey, green, grey colors. The commercial uses of Rhyolite are gemstone, laboratory bench tops, jewelry and that of Lamprophyre are an oil and gas reservoir, as a feed additive for livestock, gemstone, metallurgical flux, production of lime, soil conditioner, source of magnesia (mgo).