Pumice

Anorthosite

Pumice and Anorthosite

Pumice

Anorthosite

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Definition

Pumice is a volcanic rock that consists of highly vesicular rough textured volcanic glass, which may or may not contain crystals

Anorthosite is a granular igneous rock composed largely of labradorite or plagioclase

History

Origin

Spain

Discoverer

Unknown

Etymology

From Old French pomis, from a Latin dialect variant of pumex

From French anorthose plagioclase + -ite1

Class

Igneous Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Family

Group

Volcanic

Plutonic

Other Categories

Fine Grained Rock, Opaque Rock

Coarse Grained Rock, Opaque Rock

Texture

Vesicular

Foliated, Glassy

Color

Beige, Grey, Light Green, Light Grey, Pink, White, Yellow- grey

Black, Bluish - Grey, Brown, Green, Grey, Light Greenish Grey, Pink, White

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Vesicular

Layered, Banded, Veined and Shiny

Uses

Architecture

Interior Uses

Decorative Aggregates, Flooring, Homes, Interior Decoration

Decorative Aggregates, Floor Tiles, Homes, Interior Decoration

Exterior Uses

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

As Building Stone, As Facing Stone, Garden Decoration

Other Architectural Uses

Curbing, Powder

Curbing

Industry

Construction Industry

As Dimension Stone, Cement Manufacture, for Road Aggregate, In landscaping and horticulture, Making natural cement, Production of lightweight concrete blocks

As Dimension Stone, Cement Manufacture, for Road Aggregate

Medical Industry

As an abrasive in skin exfoliating products, In Chemical and Pharmaceutical Industry, Medicines and Cosmetics

Antiquity Uses

Artifacts

Artifacts, Sculpture, Small Figurines

Other Uses

Commercial Uses

As a traction material on snow-covered roads, As an abrasive in pencil erasers, Fine abrasive used for polishing, Manufacture of Soap, Solvents, Dyes, Plastics and Fibres, Used in aquariums

Creating Artwork, Curling

Types

Scoria

Proterozoic Anorthosite and Archean Anorthosite

Features

Host Rock for Lead

Generally rough to touch, Is one of the oldest rock

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

Pumice rock forms when the magma cools so quickly that atoms in the melt are not able to arrange themselves into a crystalline structure.

Anorthosite is a phaneritic, intrusive igneous rock which is characterized by a predominance of plagioclase feldspar which is almost 90–100%, and a minimal mafic component.

Composition

Mineral Content

Aluminum Oxides, Calcite, Carbonate, Iron Oxides, Silica

Amphibole, Clinopyroxene, Ilmenite, Magnetite, Olivine, Orthopyroxene

Compound Content

Al, Aluminium Oxide, CaO, Carbon Dioxide, MgO, Silicon Dioxide

Ca, CaO, Chromium(III) Oxide, MgO, Sulfur Trioxide

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Burial Metamorphism, Impact Metamorphism

Cataclastic Metamorphism, Contact Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Biological Weathering

Erosion

✔ ✘

Types of Erosion

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

Chemical Erosion, Wind Erosion

Properties

Physical Properties

Hardness

65-6

1 7

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Grain Size

Fine Grained

Coarse Grained

Fracture

Planar

Irregular

Streak

White, Greenish White or Grey

White

Porosity

Highly Porous

Less Porous

Luster

Earthy

Pearly to Subvitreous

Compressive Strength

51.20 N/mm²180.00 N/mm²

0.15 450

👆🏻

Cleavage

Perfect

Toughness

Specific Gravity

2.862.62-2.82

0 8.4

👆🏻

Transparency

Opaque

Translucent

Density

0.25-0.3 g/cm³2.7-4 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.87 kJ/Kg K0.84 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Impact Resistant, Pressure Resistant

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

Reserves

Deposits in Eastern Continents

Asia

Afghanistan, Indonesia, Japan, Russia

Africa

Ethiopia, Kenya, Tanzania

Europe

Greece, Hungary, Iceland, Italy, Turkey

Bulgaria, France, Germany, Greece, Hungary, Italy, Latvia, Lithuania, Malta, Poland, Portugal, Romania, Slovenia, Spain, Sweden, The Czech Republic

Others

Deposits in Western Continents

North America

Bahamas, Barbados, Canada, Costa Rica, Cuba, Jamaica, Mexico, USA

Canada

South America

Argentina, Chile, Ecuador, Peru

Bolivia, Colombia

Deposits in Oceania Continent

Australia

New Zealand, Western Australia

Central Australia, South Australia, Western Australia

All about Pumice and Anorthosite Properties

Know all about Pumice and Anorthosite properties here. All properties of rocks are important as they define the type of rock and its application. Pumice and Anorthosite belong to Igneous Rocks.Texture of Pumice is Vesicular whereas that of Anorthosite is Foliated, Glassy. Pumice appears Vesicular and Anorthosite appears Layered, Banded, Veined and Shiny. The luster of Pumice is earthy while that of Anorthosite is pearly to subvitreous. Pumice is available in beige, grey, light green, light grey, pink, white, yellow- grey colors whereas Anorthosite is available in black, bluish - grey, brown, green, grey, light greenish grey, pink, white colors. The commercial uses of Pumice are as a traction material on snow-covered roads, as an abrasive in pencil erasers, fine abrasive used for polishing, manufacture of soap, solvents, dyes, plastics and fibres, used in aquariums and that of Anorthosite are creating artwork, curling.