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POINT BAR

 Posted on :- 2020-04-27 21:42:47
POINT BAR DEPOSITS ARE ASSOCIATED MEANDERING RIVER PATTERN 
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POTHOLES

 Posted on :- 2020-04-27 21:28:56
Potholes are roughly cylindrical or bowl-shaped depressions IN ROCKS OF RIVER AND inshore platforms that are ground out by the swirling action of sand, gravel, pebbles, andboulders associated with wave action.  
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PENETRATION TWIN

 Posted on :- 2020-04-27 21:14:38
Penetration Twins - have an irregular composition surface separating 2 individual crystals. These are defined by a twin center or twin axis. Shown here is a twinned crystal of orthoclase twinned on the Carlsbad Law with [001] as the twin axis.
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CONTACT TWIN

 Posted on :- 2020-04-27 21:17:15
Contact Twins - have a planar composition surface separating 2 individual crystals. These are usually defined by a twin law that expresses a twin plane (i.e. an added mirror plane). An example shown here is a crystal of orthoclase twinned on the Braveno Law, with {021} as the twin plane.
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TWIN PLANE

 Posted on :- 2020-04-27 21:04:19
Reflection across a mirror plane. The added mirror plane would then be called a twin plane.  
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CLEAVAGE

 Posted on :- 2020-04-27 20:18:13
Cleavage. The breaking of a mineral along with a set of parallel, identical atomic planes.
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PHYSICAL PROPERTIES OF OLIVINE

 Posted on :- 2020-04-27 20:17:14
•Form: Primatic crystals; at times as massive and compact, granular grains• Colour: Shades of green (olive green) to black•Streak: colourless• Lustre: Vitreous; transparent to translucent•Fracture: conchoidal•H: 6-7•Sp. G: 3.2 (Fo) to 4.3 (Fay)
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