Hawaiite

Pseudotachylite

Hawaiite and Pseudotachylite

Hawaiite

Add ⊕

Definition

Hawaiite is volcanic rock that resembles basalt. It is an olivine basalt with intermediate composition between alkali olivine and mugearite

Very fine grained fault rock which is composed of glassy matrix that often contains inclusions of wall-rock fragments.

History

Origin

Hawaii Islands

USA

Discoverer

Joseph Iddings

Unknown

Etymology

From Hawaii Islands

From pseudo- +‎ tachylite, a glassy rock generated by frictional heat within faults.

Class

Igneous Rocks

Metamorphic Rocks

Sub-Class

Durable Rock, Medium Hardness Rock

Durable Rock, Hard Rock

Family

Group

Volcanic

Other Categories

Opaque Rock

Fine Grained Rock, Opaque Rock

Texture

Glassy, Massive, Porphyritic, Scoriaceous, Vesicular

Quench

Color

Black, Brown, Light to Dark Grey

Black, Brown, Green, Grey, Pink, White

Maintenance

Less

Durability

Durable

Water Resistant

✔ ✘

Scratch Resistant

✔ ✘

Stain Resistant

✔ ✘

Wind Resistant

✔ ✘

Acid Resistant

✔ ✘

Appearance

Dull and Soft

Uses

Architecture

Interior Uses

Decorative Aggregates, Floor Tiles, Flooring, Homes, Hotels, Interior Decoration, Kitchens

Decorative Aggregates, Entryways, Interior Decoration

Exterior Uses

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

As Building Stone, As Facing Stone, Garden Decoration

Other Architectural Uses

Curbing

Industry

Construction Industry

As Dimension Stone, Cobblestones, Rail Track Ballast, Roadstone

As Dimension Stone, Cement Manufacture, for Road Aggregate, Making natural cement

Medical Industry

Antiquity Uses

Artifacts

Artifacts, Monuments

Other Uses

Commercial Uses

Creating Artwork, Sea Defence

Creating Artwork, Gemstone

Types

Volcanic rock

Cataclastic rock

Features

Has High structural resistance against erosion and climate, Very fine grained rock

Host Rock for Lead

Archaeological Significance

Monuments

Famous Monuments

Easter Island in the Polynesian Triangle, Pacific Ocean

Sculpture

Famous Sculptures

Pictographs

Petroglyphs

Figurines

Fossils

Absent

Formation

Hawaiite is a fine-grained, hard rock that forms when bits of lava shoot out of volcanoes and reach the Earth's surface.

Due to change in environmental conditions, rocks are heated and pressurized deep inside the Earth's surface. Pseudotachylite is formed from the extreme heat caused by magma or by the intense collisions and friction of tectonic plates.

Composition

Mineral Content

Olivine, Plagioclase, Pyroxene

Iron Oxides, Pyroxene, Quartz, Stishovite, Sulfides

Compound Content

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

Carbon Dioxide, Silicon Dioxide, Sulfur Dioxide, Sulphur

Transformation

Metamorphism

✔ ✘

Types of Metamorphism

Impact Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism

Weathering

✔ ✘

Types of Weathering

Biological Weathering

Erosion

✔ ✘

Types of Erosion

Properties

Physical Properties

Hardness

1 7

👆🏻

Grain Size

Very fine-grained

Fracture

Conchoidal

Uneven

Streak

Light to dark brown

Porosity

Less Porous

Luster

Vitreous

Compressive Strength

37.40 N/mm²60.00 N/mm²

0.15 450

👆🏻

Cleavage

Toughness

Specific Gravity

-99992.46-2.86

0 8.4

👆🏻

Transparency

Opaque

Transparent to Translucent

Density

-9999 g/cm³2.7-2.9 g/cm³

0 1400

👆🏻

Thermal Properties

Specific Heat Capacity

0.84 kJ/Kg K0.92 kJ/Kg K

0.14 3.2

👆🏻

Resistance

Heat Resistant, Pressure Resistant, Wear Resistant

Heat Resistant

Reserves

Deposits in Eastern Continents

Asia

India, Russia

South Korea

Africa

South Africa

Western Africa

Europe

Iceland

Great Britain, Switzerland

Others

Hawaii Islands

Deposits in Western Continents

North America

Canada, USA

South America

Brazil

Deposits in Oceania Continent

Australia

Central Australia, Western Australia

All about Hawaiite and Pseudotachylite Properties

Know all about Hawaiite and Pseudotachylite properties here. All properties of rocks are important as they define the type of rock and its application. Hawaiite belongs to Igneous Rocks while Pseudotachylite belongs to Metamorphic Rocks.Texture of Hawaiite is Glassy, Massive, Porphyritic, Scoriaceous, Vesicular whereas that of Pseudotachylite is Quench. Hawaiite appears Dull and Soft and Pseudotachylite appears Dull and Soft. The luster of Hawaiite is while that of Pseudotachylite is vitreous. Hawaiite is available in black, brown, light to dark grey colors whereas Pseudotachylite is available in black, brown, green, grey, pink, white colors. The commercial uses of Hawaiite are creating artwork, sea defence and that of Pseudotachylite are creating artwork, gemstone.