Dacite

Quartzite

Dacite and Quartzite

Dacite

Quartzite

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Definition

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

Quartzite is a non-foliated metamorphic rock that forms by the metamorphism of pure quartz Sandstone

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 quartz + -ite

Class

Igneous Rocks

Metamorphic Rocks

Sub-Class

Durable Rock, Soft Rock

Durable Rock, Hard Rock

Family

Group

Volcanic

Other Categories

Fine Grained Rock, Medium Grained Rock, Opaque Rock

Medium Grained Rock, Opaque Rock

Texture

Aphanitic to Porphyritic

Foliated, Granular

Color

Bluish - Grey, Brown, Grey, Light to Dark Grey

Black, Blue, Brown, Green, Light Grey, Purple, White, Yellow

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Vesicular

Lustrous

Uses

Architecture

Interior Uses

Decorative Aggregates, Entryways, Interior Decoration

Countertops, Decorative Aggregates, Flooring, Homes

Exterior Uses

As Building Stone, Paving Stone, Garden Decoration

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

Other Architectural Uses

Curbing

Industry

Construction Industry

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

Arrowheads, As Dimension Stone, Cement Manufacture, Construction Aggregate, Cutting Tool, for Road Aggregate, Making natural cement, Production of Glass and Ceramics, Rail Track Ballast, Roadstone

Medical Industry

Antiquity Uses

Artifacts

Artifacts, Jewellery, Monuments, Sculpture

Other Uses

Commercial Uses

Commemorative Tablets, Creating Artwork

An Oil and Gas Reservoir, As armour rock for sea walls, Cemetery Markers, Commemorative Tablets, In aquifers, Laboratory bench tops, Petroleum reservoirs, Soil Conditioner, Source of Magnesia (MgO), Tombstones, Used in aquariums

Types

Footwall Dacite, Hanging wall Dacite, Tuff and Biotite Dacite

Orthoquartzite and Metaquartzite

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.

Quartzite forms from sandstone and the mineral quartz being put under extreme heat and pressure.

Composition

Mineral Content

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

Chlorite, Epidote, Hematite, Kyanite, Magnetite, Muscovite or Illite, Quartz

Compound Content

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

Aluminium Oxide, CaO, Iron(III) Oxide, MgO, Sodium Oxide, Silicon Dioxide

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Hydrothermal Metamorphism, Regional Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

Chemical Erosion

Chemical Erosion, Coastal Erosion, Water Erosion, Wind Erosion

Properties

Physical Properties

Hardness

2-2.256-7

1 7

👆🏻

Grain Size

Medium to Fine Coarse Grained

Medium Grained

Fracture

Conchoidal

Uneven, Splintery or Conchoidal

Streak

White

Porosity

Less Porous

Luster

Subvitreous to Dull

Vitreous

Compressive Strength

70.00 N/mm²115.00 N/mm²

0.15 450

👆🏻

Cleavage

Perfect

Indiscernible

Toughness

1.9

Specific Gravity

2.86-2.872.6-2.8

0 8.4

👆🏻

Transparency

Translucent

Transparent to Translucent

Density

2.77-2.771 g/cm³2.32-2.42 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.92 kJ/Kg K0.75 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

China, India, Israel, Russia, South Korea, Thailand, Turkey

Africa

Ethiopia, Morocco, South Africa, Zimbabwe

Europe

France, Greece, Romania, Scotland, Spain

England, Italy, Norway, Scotland, Sweden, United Kingdom

Others

Greenland

Deposits in Western Continents

North America

USA

Bahamas, Canada, USA

South America

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

Brazil, Colombia, Venezuela

Deposits in Oceania Continent

Australia

New Zealand, South Australia, Western Australia

New Zealand, Queensland, Western Australia

All about Dacite and Quartzite Properties

Know all about Dacite and Quartzite properties here. All properties of rocks are important as they define the type of rock and its application. Dacite belongs to Igneous Rocks while Quartzite belongs to Metamorphic Rocks.Texture of Dacite is Aphanitic to Porphyritic whereas that of Quartzite is Foliated, Granular. Dacite appears Vesicular and Quartzite appears Lustrous. The luster of Dacite is subvitreous to dull while that of Quartzite is vitreous. Dacite is available in bluish - grey, brown, grey, light to dark grey colors whereas Quartzite is available in black, blue, brown, green, light grey, purple, white, yellow colors. The commercial uses of Dacite are commemorative tablets, creating artwork and that of Quartzite are an oil and gas reservoir, as armour rock for sea walls, cemetery markers, commemorative tablets, in aquifers, laboratory bench tops, petroleum reservoirs, soil conditioner, source of magnesia (mgo), tombstones, used in aquariums.