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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 Nicola...

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Growth fault
Growth fault

Growth faults are syndepositional or syn-sedimentary extensional faults that initiate and evolve...

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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, for...

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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 un...

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Oil shale
Oil shale

Oil shale , also known as kerogen shale, is an organic-rich fine-grained sedimentary rock contai...

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Drainage pattern
Drainage pattern

Drainage pattern     a pattern created by stream erosion over time that reveals characteristics...

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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 ...

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Volcanology
Volcanology

Volcanology   is the study of volcanoes, lava, magma, and related geological, geophysical and geo...

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Luster of Minerals
Luster of Minerals

Minerals may be categorized according to whether they are  opaque  or  transpare...

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The Streak of Minerals
The Streak of Minerals

Streak plates with pyrite (left) and rhodochrosite (right)        The streak (also cal...

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Andradite
Andradite

Locality: Dashkesan (Dashkezan) Co-Fe deposit, Dashkesan, Daşkəsən (Daskasan; Dashkyasan) Dist...

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Acicular Natrolit from India
Acicular Natrolit from India

Natrolite is a tectosilicate mineral species belonging to the zeolite group. Formula: Na2Al2S...

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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 dur...

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Fantastic Azurite
Fantastic Azurite

Azurite |‪#‎Geology Formula: Cu3(CO3)2(OH)2 System:Monoclinic Colour:Azure blue, blue...

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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...

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Order of Geologic Events
Order of Geologic Events

Applying basic geologic principles: Laws of original horizontality, superposition, and cross-cu...

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beautiful Amethyst
beautiful Amethyst

Locality: Don Nicolas Mine, Villa Benegas, Mina Clavero, San Alberto Department, Córdoba, Arge...

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Principle of original horizontality
Principle of original horizontality

Principle of original horizontality The Principle of Original Horizontality was proposed by...

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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 ...

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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 nuc...

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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 f...

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Types of Tectonic Boundaries
Types of Tectonic Boundaries

  Divergent boundary —when plates diverge, spreading centers form creating new oceanic crust. E...

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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, geologi...

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