Picrite

Breccia

Picrite and Breccia

Picrite

Breccia

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Definition

Picrite is a variety of high-magnesium olivine basalt that is very rich in the mineral olivine

Breccia is a rock consisting of angular fragments of stones which are cemented by finer calcareous material

History

Origin

Hawaii Islands

England

Discoverer

Unknown

Etymology

From Greek pikros bitter + -ite, 19th century

From Italian, literally gravel, Germanic origin and related to break

Class

Igneous Rocks

Sedimentary Rocks

Sub-Class

Durable Rock, Hard Rock

Family

Group

Volcanic

Other Categories

Fine Grained Rock, Opaque Rock

Coarse Grained Rock, Medium Grained Rock, Opaque Rock

Texture

Earthy, Rough

Brecciated, Clastic

Color

Black, Brown, Green, Grey, Pink, White, Yellow

Beige, Black, Blue, Brown, Buff, Green, Grey, Orange, Pink, Purple, Red, Rust, White, Yellow

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Rough and Shiny

Layered, Banded, Veined and Shiny

Uses

Architecture

Interior Uses

Countertops, Decorative Aggregates, Homes, Interior Decoration

Countertops, Decorative Aggregates, Entryways, Floor Tiles, Flooring, Homes, Hotels, Interior Decoration

Exterior Uses

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

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

Other Architectural Uses

Curbing

Industry

Construction Industry

As a Sintering Agent in Steel Industry to process Iron Ore, Cement Manufacture, for Road Aggregate, Manufacture of Magnesium and Dolomite Refractories, Roadstone, Used for flooring, stair treads, borders and window sills.

As Dimension Stone, Construction Aggregate, Landscaping, Roadstone

Medical Industry

Antiquity Uses

Artifacts, Monuments, Sculpture

Artifacts, Sculpture

Other Uses

Commercial Uses

As a Feed Additive for Livestock, As armour rock for sea walls, Metallurgical Flux, Pottery, Source of Magnesia (MgO)

Creating Artwork, Gemstone, Jewelry

Types

Oceanite

Collapse Breccia, Fault Breccia, Flow Breccia, Pyroclastic Breccia, Igneous Breccia and Impact Breccia

Features

Host Rock for Lead

Available in Lots of Colors and Patterns, Clasts are smooth to touch

Archaeological Significance

Monuments

Famous Monuments

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Present

Formation

Picrite is a fine-grained, hard rock which is a type of metasomatite, essentially altered basalt. It forms with or without crystallization, either below the surface as intrusive rocks or on the surface as extrusive rocks.

Breccia is a clastic sedimentary rock which is composed of broken fragments of minerals or rock which are cemented together by a fine-grained matrix and it forms where broken, angular fragments of rock or mineral debris accumulate.

Composition

Mineral Content

Biotite, Olivine, Plagioclase, Pyrrhotite

Calcite, Clay, Feldspar, Phosphates, Quartz, Silica

Compound Content

Al, CaO, Carbon Dioxide, Mg, MgO

Aluminium Oxide, Ca, NaCl, CaO, Iron(III) Oxide, Potassium Oxide, Sodium Oxide, Silicon Dioxide, Titanium Dioxide

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Impact Metamorphism, Regional Metamorphism

Burial Metamorphism, Cataclastic Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering

Biological Weathering, Chemical Weathering, Mechanical Weathering

Erosion

✔ ✘

Types of Erosion

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

Chemical Erosion

Properties

Physical Properties

Hardness

6.87

1 7

👆🏻

Grain Size

Fine Grained

Medium to Coarse Grained

Fracture

Uneven

Streak

White, Greenish White or Grey

White

Porosity

Less Porous

Luster

Subvitreous to Dull

Dull to Pearly

Compressive Strength

189.00 N/mm²180.00 N/mm²

0.15 450

👆🏻

Cleavage

Toughness

2.1

Specific Gravity

2.75-2.922.86-2.87

0 8.4

👆🏻

Transparency

Opaque

Density

1.5-2.5 g/cm³0 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.88 kJ/Kg K0.84 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant

Heat Resistant, Impact Resistant, Pressure Resistant, Wear Resistant

Reserves

Deposits in Eastern Continents

Asia

India, Russia

China, India, Kazakhstan, Mongolia, Russia, South Korea, Uzbekistan

Africa

South Africa

Namibia, Nigeria, South Africa

Europe

Iceland

Austria, Denmark, Germany, Great Britain, Netherlands, Norway, Poland, Sweden, Switzerland, United Kingdom

Others

Greenland

Deposits in Western Continents

North America

Canada, USA

Barbados, Canada, Mexico, Panama, USA

South America

Brazil

Deposits in Oceania Continent

Australia

New South Wales, New Zealand

All about Picrite and Breccia Properties

Know all about Picrite and Breccia properties here. All properties of rocks are important as they define the type of rock and its application. Picrite belongs to Igneous Rocks while Breccia belongs to Sedimentary Rocks.Texture of Picrite is Earthy, Rough whereas that of Breccia is Brecciated, Clastic. Picrite appears Rough and Shiny and Breccia appears Layered, Banded, Veined and Shiny. The luster of Picrite is subvitreous to dull while that of Breccia is dull to pearly. Picrite is available in black, brown, green, grey, pink, white, yellow colors whereas Breccia is available in beige, black, blue, brown, buff, green, grey, orange, pink, purple, red, rust, white, yellow colors. The commercial uses of Picrite are as a feed additive for livestock, as armour rock for sea walls, metallurgical flux, pottery, source of magnesia (mgo) and that of Breccia are creating artwork, gemstone, jewelry.