batuan beku3

8/12/2019 Batuan beku3

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Peridotite

Location: Marquette County,

Michigan

Description: term used forcourse-grained olivine-rich rocks

in which olivine is the dominatemineral but is les than !" of the

rock#

Sandstone

Location: Los $ngeles County,

C$

Description: a well cementedsedimentary rock consisting of

predominantly quarts#


2/13

Bituminous Shale

Location: %tica, &'

Description: a laminated or

fossile mudrock#

Coquina

Location: (t# $ugustine, )L

Description: &*$


3/13

Phosphorite

Location: +arstow, )L

Description: an aphanitic to

phaneritic, typically brown toblack rock that is oolitic,

laminated, nodular, orfossiliferous, with more that !"

apatite#

.aymond, p#/0!

Pyroxenite

Location: .ustenburg District,

1ransvaal, .($

Description: an ultramafic rock

consisting of mostly pyro2ene3s45

possible accessory mineralsinclude olivine, spinel, garnet,

hornblende, biotite, feldspar, and

nepheline#


4/13

Arkose

Location: 6ardiner, Montana

Description: type of sandstone

that is rich in feldspars#

Ferruginous Shale

Location: Deep .un, 7$


fossile mudrock#


5/13

Lithographic Limestone

Location: (olnhofen, 6ermany

Description: an e2tremely fine-grained,

dense, compact, pale yellow or grayishlimestone that e2hibits conchoidal

fracture#

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Dolomite, Variegated

Location: Marquette, Michigan

Description: slightlymetamorphosed limestone# $

distinguishing feature of the

dolomite is its harness incomparison to limestone# $lso

often will contain ooids#


6/13

u!!

Location: 7ima County, $.

Description: this fragmental

rock consists of crystals ofquart9, alkali feldspar and

plagioclase of various si9es andshapes, pieces of glassy rhyolite

and pieces of fine-grained tuff,

all enclosed in a fine-grained

banded ash matri2 whichoriginally may have been

glassy#

Macen9ie, p# ;

"icaceous Sandstone

Location: 7ortland, C1

Description: a well cemented

sedimentary rock consisting of

predominantly quarts#


7/13

Arenaceous Shale

Location: .avena, &'


fossile mudrock#

Dolomitic Limestone

Location: asota, M&

Description: a limestone in whichthe carbonate fraction consists

mostly of dolomite and calcite,

with calcite being more abundant#


8/13

Peperino u!!

Location: $lbano, .ome,


9/13

Siltstone

Location: Collinsville,

Chalcedony

Location: 1ampa +ay, )L

Description: Chalcedony is the namegiven to compact varieties of silica

which comprise minute quart9

crystals with sub-microscopic pores#1here are two main varieties:

chalcedony, which is uniformly

colored, and agate which ischaracteri9ed by curved bands or

9ones of differing color#

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10/13

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Di!!usion Dolomite

Location: )remont County, C=

Description: $cording to Loren

.aymond, diffusion refers to the

migration of chemical species

through magma in respounce todifferences 3gradients4 in

pressure, temperature, or chemical

state#

.aymond, p#0

#elded u!!

Location:


11/13

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"ar$le $reccia

Location: Madoc, =ntario,

Canada

Description: breccia refers to acoarse clastic rock composed of

angular fragments of older rocks

that are cemented together in afine matri25 formed in a number

of ways from a variety of

materials#


12/13

ra%ertine

Location: 1rivoli,


13/13

&o%aculite

Location: Bot (prings, $.

Description: a light-colored, dense, hard,

fine-grained, even-te2tured siliceoussedimentary rock characteri9ed by the

dominance of microcrystalline quart9 overchalcedony#

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Chalk

Location: Dover, Angland

Description: a soft, earthy,friable, porous, light-colored

limestone#

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