Porphyry

Siltstone

Porphyry and Siltstone

Porphyry

Siltstone

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1 Definition

1.2 Definition

Porphyry is a reddish-brown to purple igneous rock containing large phenocrysts of various minerals embedded in a fine-grained matrix

Siltstone can be defined as a fine-grained sedimentary rock which mainly consists of consolidated silt

1.3 History

1.3.1 Origin

Egypt

Unknown

1.3.2 Discoverer

Unknown

1.4 Etymology

From Old French porfire, from Italian porfiro and in some cases directly from Latin porphyrites

From English word silt and stone and from Proto-Indo-European root sal and stainaz

1.6 Class

Igneous Rocks

Sedimentary Rocks

1.6.1 Sub-Class

Durable Rock, Hard Rock

1.8 Family

1.8.1 Group

Plutonic

Not Applicable

1.9 Other Categories

Fine Grained Rock, Opaque Rock

3 Texture

3.1 Texture

Porphyritic

Clastic

3.2 Color

Black, Brown, Colourless, Green, Grey, Red, Rust, White

Brown, Red, Reddish Brown

3.3 Maintenance

Less

3.5 Durability

Durable

3.5.1 Water Resistant

✔ ✘

81% Igneous Rocks Rocks have it !

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59% Sedimentary Rocks Rocks have it !

3.6.5 Scratch Resistant

✔ ✘

86% Igneous Rocks Rocks have it !

✔ ✘

62% Sedimentary Rocks Rocks have it !

3.6.9 Stain Resistant

✔ ✘

66% Igneous Rocks Rocks have it !

✔ ✘

43% Sedimentary Rocks Rocks have it !

4.2.2 Wind Resistant

✔ ✘

49% Igneous Rocks Rocks have it !

✔ ✘

38% Sedimentary Rocks Rocks have it !

4.3.2 Acid Resistant

✔ ✘

48% Igneous Rocks Rocks have it !

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22% Sedimentary Rocks Rocks have it !

4.4 Appearance

Dull

Rough

5 Uses

5.1 Architecture

5.1.1 Interior Uses

Decorative Aggregates, Interior Decoration

5.1.3 Exterior Uses

Garden Decoration, Paving Stone

As Building Stone, As Facing Stone, Garden Decoration

5.1.4 Other Architectural Uses

Curbing

5.2 Industry

5.2.1 Construction Industry

Construction Aggregate

Building houses or walls, Cement Manufacture, Construction Aggregate, for Road Aggregate, Making natural cement, Raw material for the manufacture of mortar

5.2.2 Medical Industry

Not Yet Used

5.3 Antiquity Uses

Artifacts, Monuments, Sculpture

Artifacts, Sculpture, Small Figurines

6.2 Other Uses

6.2.1 Commercial Uses

Creating Artwork, Gemstone, Jewelry

Raw material for the manufacture of mortar, Soil Conditioner

7 Types

7.1 Types

Rhomb Porphyry

Not Available

7.2 Features

Generally rough to touch, Is one of the oldest rock, Surfaces are often shiny

Available in Lots of Colors and Patterns, Easily splits into thin plates, Generally rough to touch, High silica content, Very fine grained rock

7.3 Archaeological Significance

7.3.1 Monuments

Used

Not Yet Used

7.3.3 Famous Monuments

Data Not Available

Not Applicable

7.3.5 Sculpture

Used

7.3.6 Famous Sculptures

Data Not Available

7.3.8 Pictographs

Not Used

7.3.9 Petroglyphs

Not Used

7.3.11 Figurines

Used

7.4 Fossils

Absent

Present

8 Formation

8.1 Formation

Porphyry is formed in two stages: the magma cools slowly deep within the crust or the magma is cools rapidly as it erupts from a volcano, creating small grains that are usually invisible to naked eye.

Siltstone is a type of sedimentary rock which is formed from fine rock particles. As the particles of eroded rock travel along with water, the edges of the rock are worn-out by water into a rounded shape.

8.2 Composition

8.2.1 Mineral Content

Biotite, Chert, Feldspar, Garnet, Graphite, Quartz, Silica

Calcite, Clay, Clay Minerals, Feldspar, Micas, Quartz, Sand, Silica, Silt

8.2.2 Compound Content

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

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

8.3 Transformation

8.3.1 Metamorphism

✔ ✘

97% Igneous Rocks Rocks have it !

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19% Sedimentary Rocks Rocks have it !

8.3.2 Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional Metamorphism

Not Applicable

8.3.3 Weathering

✔ ✘

99% Igneous Rocks Rocks have it !

✔ ✘

78% Sedimentary Rocks Rocks have it !

8.3.4 Types of Weathering

Biological Weathering, Chemical Weathering, Not Registered

Biological Weathering, Chemical Weathering, Mechanical Weathering

8.3.5 Erosion

✔ ✘

92% Igneous Rocks Rocks have it !

✔ ✘

86% Sedimentary Rocks Rocks have it !

8.3.6 Types of Erosion

Chemical Erosion, Coastal Erosion, Glacier Erosion

9 Properties

9.1 Physical Properties

9.1.1 Hardness

6-7

9.1.2 Grain Size

Fine Grained

9.1.3 Fracture

Irregular

Conchoidal

9.1.4 Streak

White

9.1.5 Porosity

Less Porous

Highly Porous

9.1.6 Luster

Dull

9.1.7 Compressive Strength

What Is Flint

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Not Available

Rank: N/A (Overall)▶

Not Available

Rank: N/A (Overall)▶

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What Is Obsidian

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175 (What Is Grani..)

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10.1.4 Cleavage

Imperfect

Not Available

10.1.5 Toughness

1.7

2.6

10.1.7 Specific Gravity

2.5-4

2.54-2.73

10.2.3 Transparency

Translucent to Opaque

Opaque

10.2.4 Density

2.5-2.52 g/cm³

2.6-2.7 g/cm³

10.4 Thermal Properties

10.4.1 Specific Heat Capacity

What Is Banded ..

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▶

▼

Not Available

Rank: N/A (Overall)▶

Not Available

Rank: N/A (Overall)▶

▲

What Is Granulite

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1.09 (What Is Trave..)

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10.4.2 Resistance

Heat Resistant, Impact Resistant

Heat Resistant, Impact Resistant, Pressure Resistant, Water Resistant

11 Reserves

11.1 Deposits in Eastern Continents

11.1.1 Asia

China, Kazakhstan, South Korea, Thailand, Turkey, Vietnam

China, India, Kazakhstan, Mongolia, Russia, Uzbekistan

11.1.2 Africa

Egypt, Ethiopia, Ghana, South Africa

Namibia, Nigeria, South Africa

11.1.3 Europe

Finland, France, Germany, Great Britain, Hungary, Iceland, Ireland, Italy, Netherlands, Norway, Romania, Sweden, Switzerland

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

11.1.4 Others

Greenland

11.2 Deposits in Western Continents

11.2.1 North America

Canada, Cuba, Jamaica, USA

Canada, USA

11.2.2 South America

Bolivia, Brazil, Colombia, Ecuador, Paraguay

Brazil

11.3 Deposits in Oceania Continent

11.3.1 Australia

New South Wales, New Zealand, Western Australia

New South Wales, New Zealand

All about Porphyry and Siltstone Properties

Know all about Porphyry and Siltstone properties here. All properties of rocks are important as they define the type of rock and its application. Porphyry belongs to Igneous Rocks while Siltstone belongs to Sedimentary Rocks.Texture of Porphyry is Porphyritic whereas that of Siltstone is Clastic. Porphyry appears Dull and Siltstone appears Rough. The luster of Porphyry and Siltstone is dull. Porphyry is available in black, brown, colourless, green, grey, red, rust, white colors whereas Siltstone is available in brown, red, reddish brown colors. The commercial uses of Porphyry are creating artwork, gemstone, jewelry and that of Siltstone are raw material for the manufacture of mortar, soil conditioner.