Dacite

Anorthosite

Dacite and Anorthosite

Dacite

Anorthosite

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Definition

Dacite is a volcanic igneous rock which is rintermediate in composition between andesite and rhyolite

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

History

Origin

Romania and Moldova, Europe

Discoverer

Unknown

Etymology

From Dacia, a province of the Roman Empire which lay between the Danube River and Carpathian Mountains where the rock was first described

From French anorthose plagioclase + -ite1

Class

Igneous Rocks

Sub-Class

Durable Rock, Soft Rock

Durable Rock, Medium Hardness Rock

Family

Group

Volcanic

Plutonic

Other Categories

Fine Grained Rock, Medium Grained Rock, Opaque Rock

Coarse Grained Rock, Opaque Rock

Texture

Aphanitic to Porphyritic

Foliated, Glassy

Color

Bluish - Grey, Brown, Grey, Light to Dark 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, Entryways, Interior Decoration

Decorative Aggregates, Floor Tiles, Homes, Interior Decoration

Exterior Uses

As Building Stone, Paving Stone, Garden Decoration

As Building Stone, As Facing Stone, Garden Decoration

Other Architectural Uses

Curbing

Industry

Construction Industry

As Dimension Stone, Construction Aggregate, for Road Aggregate, Landscaping

As Dimension Stone, Cement Manufacture, for Road Aggregate

Medical Industry

Antiquity Uses

Artifacts

Artifacts, Sculpture, Small Figurines

Other Uses

Commercial Uses

Commemorative Tablets, Creating Artwork

Creating Artwork, Curling

Types

Footwall Dacite, Hanging wall Dacite, Tuff and Biotite Dacite

Proterozoic Anorthosite and Archean Anorthosite

Features

Host Rock for Lead, Is one of the oldest rock

Generally rough to touch, Is one of the oldest rock

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

Dacitic magma is formed by the subduction of young oceanic crust under a thick felsic continental plate. Further, the Oceanic crust is hydrothermally altered as quartz and sodium are added.

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

Amphibole, Apatite, Biotite, Feldspar, Garnet, Hornblade, Magnetite, Plagioclase, Pyroxene, Quartz, Zircon

Amphibole, Clinopyroxene, Ilmenite, Magnetite, Olivine, Orthopyroxene

Compound Content

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

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

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism

Cataclastic Metamorphism, Contact Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Biological Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion

Chemical Erosion, Wind Erosion

Properties

Physical Properties

Hardness

2-2.255-6

1 7

👆🏻

Grain Size

Medium to Fine Coarse Grained

Coarse Grained

Fracture

Conchoidal

Irregular

Streak

White

Porosity

Less Porous

Luster

Subvitreous to Dull

Pearly to Subvitreous

Compressive Strength

70.00 N/mm²180.00 N/mm²

0.15 450

👆🏻

Cleavage

Perfect

Toughness

Specific Gravity

2.86-2.872.62-2.82

0 8.4

👆🏻

Transparency

Translucent

Density

2.77-2.771 g/cm³2.7-4 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, Impact Resistant, Pressure Resistant, Wear Resistant

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

Reserves

Deposits in Eastern Continents

Asia

Africa

Europe

France, Greece, Romania, Scotland, Spain

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

USA

Canada

South America

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

Bolivia, Colombia

Deposits in Oceania Continent

Australia

New Zealand, South Australia, Western Australia

Central Australia, South Australia, Western Australia

All about Dacite and Anorthosite Properties

Know all about Dacite and Anorthosite properties here. All properties of rocks are important as they define the type of rock and its application. Dacite and Anorthosite belong to Igneous Rocks.Texture of Dacite is Aphanitic to Porphyritic whereas that of Anorthosite is Foliated, Glassy. Dacite appears Vesicular and Anorthosite appears Layered, Banded, Veined and Shiny. The luster of Dacite is subvitreous to dull while that of Anorthosite is pearly to subvitreous. Dacite is available in bluish - grey, brown, grey, light to dark grey colors whereas Anorthosite is available in black, bluish - grey, brown, green, grey, light greenish grey, pink, white colors. The commercial uses of Dacite are commemorative tablets, creating artwork and that of Anorthosite are creating artwork, curling.