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Steno's principles of stratigraphy
Steno's principles of stratigraphy

In 1669, Niels Stensen (1638-1686), better known then and now by his Latinized nameii Nicolaus Steno, formulated a few basic rules that ...

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Growth fault
Growth fault

Growth faults are syndepositional or syn-sedimentary extensional faults that initiate and evolve at the margins of continental plates. T...

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Contact Metamorphism
Contact Metamorphism

         Contact metamorphism is the name given to the changes that take place when magma is injected in     the surrounding solid roc...

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Volcanic Bomb
Volcanic Bomb

A volcanic bomb is a mass of molten rock (tephra) larger than 64 mm (2.5 inches) in diameter, formed when a volcano ejects viscous fragme...

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Hotspots the Hottest places on Earth
Hotspots the Hottest places on Earth

The places known as hotspots or hot spots in geology are volcanic regions thought to be fed by underlying mantle that is anomalously hot ...

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Oil shale
Oil shale

Oil shale , also known as kerogen shale, is an organic-rich fine-grained sedimentary rock containing kerogen (a solid mixture of organic...

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Drainage pattern
Drainage pattern

Drainage pattern     a pattern created by stream erosion over time that reveals characteristics of the kind of rocks and geologic struc...

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Cleavage of minerals
Cleavage of minerals

A cleavage plane is a plane of structural weakness along which a mineral is likely to split smoothly. Cleavage thus refers to the spli...

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Volcanology
Volcanology

Volcanology   is the study of volcanoes, lava, magma, and related geological, geophysical and geochemical phenomena. The term volcanology...

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Luster of Minerals
Luster of Minerals

Minerals may be categorized according to whether they are  opaque  or  transparent . A thin section of an opaque mineral...

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The Streak of Minerals
The Streak of Minerals

Streak plates with pyrite (left) and rhodochrosite (right) The streak (also called "powder color") of a mineral is the c...

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Andradite
Andradite

Locality: Dashkesan (Dashkezan) Co-Fe deposit, Dashkesan, Daşkəsən (Daskasan; Dashkyasan) District, Azerbaijan (Locality at mindat.org...

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Acicular Natrolit from India
Acicular Natrolit from India

Natrolite is a tectosilicate mineral species belonging to the zeolite group. Formula: Na2Al2Si3O10 · 2H2O System: Orthorhombic Colour...

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 Volcanic Ash The tiny disaster
Volcanic Ash The tiny disaster

Volcanic ash consists of fragments of pulverized rock, minerals and volcanic glass, created during volcanic eruptions, less than 2 mm (...

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Fantastic Azurite
Fantastic Azurite

Azurite |‪#‎Geology Formula: Cu3(CO3)2(OH)2 System:Monoclinic Colour:Azure blue, blue, light ... Lustre:Vitreous Hardness:3...

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Chalcedony ( Agate)
Chalcedony ( Agate)

Locality: Patagonia, Argentina Dimensions: 60 mm x 60 mm x 50 mm Size: 60 x 60 x 50 mm Collection: M. Schäfer, Piesbach Ph...

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Order of Geologic Events
Order of Geologic Events

Applying basic geologic principles: Laws of original horizontality, superposition, and cross-cutting arelationships explain the order o...

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beautiful Amethyst
beautiful Amethyst

Locality: Don Nicolas Mine, Villa Benegas, Mina Clavero, San Alberto Department, Córdoba, Argentina Dimensions: 10.5 cm x 6.5 cm x 5...

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Principle of original horizontality
Principle of original horizontality

Principle of original horizontality The Principle of Original Horizontality was proposed by the Danish geological pioneer Nicholas ...

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How Others  See Geologist
How Others See Geologist

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What is Mining?
What is Mining?

Mining is the extraction of valuable minerals or other geological materials from the earth from an orebody, lode, vein, seam, or reef, w...

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Coated Grains in limestone
Coated Grains in limestone

Ooid (oolith) - a spherical to ellipsoidal grain, 0.25 to 2.00 mm in diameter, with a nucleus covered by one or more precipitated...

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Tanzanite crystal
Tanzanite crystal

Merelani Hills, Tanzania miniature - 3.4 x 1.6 x 0.8 cm - Superb bi-color Tanzanite crystal from a new find at Merelani. Transparent ...

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Types of Tectonic Boundaries
Types of Tectonic Boundaries

  Divergent boundary —when plates diverge, spreading centers form creating new oceanic crust. Examples include mid-ocean ridges in worl...

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What do Geologists do?
What do Geologists do?

A geologist working in the Arctic A general geologist deals with mineralogy, petrology, geological mapping, economic geology, and petro...

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