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Metamorphic Rocks
pics/descriptions of rocks
11
Geology
Undergraduate 1
10/03/2010

Additional Geology Flashcards

 


 

Cards

Term
[image]
Definition

AMPHIBOLITE

Foliated or nonfoliated

Medium to coarse grained

Mostly visible crystals of amphibole (usually glossy black hornblende)

Parent: basalt, gabbro, ultramafic igneous rock

Term
[image]
Definition

GNEISS

Foliated

Medium to coarse grained

Banding; minerals segregated into alternating layers for banded texture; crystalline texture

Visible crystals of two or more minerals in alternating dark and light layers

Term
[image]
Definition

HORNFELS

Nonfoliated

Fine grained or no visible grains

Microcrystalline texture

Usually dull, dark color; very hard

Parent: any type rock

Term
[image]
Definition

MARBLE

Nonfoliated

Fine to coarse grained

Microcrystalline (sugar cube) or medium to coarse crystalline texture

Calcite (or dolomite) crystals of nearly equal size fused together; calcite effervesces in dilute HCl; dolomite effervesces if powdered

Parent: Limestone

Term
[image]
Definition

METACONGLOMERATE

Nonfoliated

Fine to coarse grained

Conglomeratic texture, but breaks across grains

Pebbles may be stretched or cut by rock clevage

Parent: Conglomerate

Term
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Definition

PHYLLITE

Foliated

Fine grained or no visible grains

Texture well developed, more than slaty cleavage

Breaks along wrinkled or wavy folliation surfaces with shiny metallic luster

Has a sheen

Term
[image]
Definition

QUARTZITE

Nonfoliated

Fine to coarse grained

Sandy texture

Quartz sand grains fused together; won't rub off; usually light colored

Parent: sandstone

Term
[image]
Definition

SCHIST

Foliated

Medium to coarse grained

Foliation formed by alignment of visible crystals; rock breaks along scaly foliation surfaces; crystalline texture

Visible sparkling crystals of platy minerals (chlorite, biotite, muscovite), bladed crystals, or prismatic crystals

Parent: mudstone, shale, slate, or phyllite

Term
[image]
Definition

SERPENTINITE

Nonfoliated

Fine grained to no visible grains

Microcrystalline texture or no visible grains; may have fibrous asbestos form

Dull or glossy; color usually shades of green

Parent: basalt, gabbro, or ultramafic igneous rock

Term
[image]
Definition

SLATE

Foliated

Flat slaty cleavage well developed

Dull luster; breaks into hard flat sheets

Parent: mudstone or shale

Term
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Definition

SOAPSTONE

Nonfoliated

Microcrystalline or no visible grains

Talc; can be scratched with fingernail

Shades of green, gray, brown, white

Parent: basalt, gabbro, or ultramafic igneous rocks

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