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Day 2: Petrology and Mineralogy > Diagnostic Test: Board Review > Flashcards

Diagnostic Test: Board Review Flashcards

1
Q

A crystal that lacks well-developed crystal faces or that has rounded or irregular form due to crowding by adjacent crystals

A

Anhedral

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2
Q

Brazil Law is a common type of twinning in which mineral?

A

Quartz

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3
Q

Atomic model which shows electrons orbit around the nucleus?

A

Bohr’s Model

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4
Q

Which of the following DOES NOT belong to the Lanthanide Series?

a. cerium
b. europium
c. ytterbium
d. uranium

A

d. uranium

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5
Q

Who classified elements based on their behaviour in a hypothetical iron alloy-silicate-sulfide-gas system?

A

Goldschmidt

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6
Q

This defect occur when an atom is displaced from the position it normally occupies to an interstitial site.

A

Frenkel

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7
Q

Which of the following is NOT a feldspathoid?

a. leucite
b. nepheline
c. sanidine
d. sodalite

A

c. sanidine

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8
Q

Which of the following minerals DOES NOT contain titanium in its chemical formula?

a. akermanite
b. ilmenite
c. rutile
d. titanite

A

a. akermanite

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9
Q

Scheelite is a mineral under which class?

A

tungstates

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10
Q

Which of the following minerals is under the scapolite group?

a. cordierite
b. heulandite
c. tridymite
d. analcime

A

b. heulandite

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11
Q

Which of the following minerals is a nesosilicate?

a. tremolite
b. enstatite
c. akermanite
d. forsterite

A

d. forsterite

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12
Q

What is the Si:O ratio of phyllosilicates?

A

2:5

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13
Q

What is the luster of sphalerite?

A

resinous

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14
Q

Very small amounts of which metal in the crystal structure of ruby gives its deep red color?

A

chromium

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15
Q

The following minerals has a streak color of shades of yellow, except:

a. orpiment
b. zincite
c. sulfur
d. chrysocolla

A

d. chrysocolla

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16
Q

It is the ability of minerals to give off visible light when they are struck by energy of a shorter wavelength ** even after the energy source is turned off**.

A

phosphorescence

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17
Q

A variety of K-feldspar exhibit opalescence

A

moonstone

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18
Q

Term used to describe a mineral habit that is needle-like?

A

acicular

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19
Q

A term which describes a mineral of which it is capable of being drawn into a wirelike shape.

A

ductile

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20
Q

An asbestiform minerals known as a blue asbestos?

A

crocidolite

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21
Q

The silica content of basic rock is:

A

45-52%

22
Q

This term describes a rock that is generally light in color.

A

leucocratic

23
Q

Given: A= 20%, B= 40%, C= 10%. After normalization, the value of A becomes:

A

29%

24
Q

A phaneritic rock has the following mode: 13% quartz, 45% plagioclase, 23% orthoclase, 5% biotite, 10% hornblende, and 4% others. This rock is therefore classified as:

A

Quartz Monzodiorite

25
Q

A phaneritic rock has an unnormalized mode of more than 90% plagioclase. This rock is classified as:

A

anorthosite

26
Q

What is the aphanitic equivalent of syenite?

A

trachyte

27
Q

What is the plutonic equivalent of dacite?

A

granodiorite

28
Q

Which of the following is NOT a type of peridotite?

a. harzburgite
b. lherzolite
c. dunite
d. websterite

A

d. websterite

29
Q

In the TAS diagram, the basaltic trachyandesite is subdivided into:

A

mugearite and shoshonite

30
Q

A pyroclastic rock is composed of the following fragments: 20% blocks, 40% lapilli, and 40% ash. This rock is classified as:

A

lapilli tuff

31
Q

Liparite is a synoym for the rock:

A

rhyolite

32
Q

A medium-grained gabbro is also known as:

A

diabase

33
Q

A diverse group of dark, porphyritic, mafic to ultramafic K-rich hypabyssal rocks.

A

lamprophyre

34
Q

A very high degree of undercooling produces a:

A

glassy rock

35
Q

A Rapaviki texture can be observed in:

A

granite

36
Q

A tactite is typically formed in:

A

contact metamorphism

37
Q

An altered basalt in which plagioclase is “albitized” as the basalts exchange Ca for Na in seawater

A

spilite

38
Q

A green and red metamorphic rock that contains clinopyroxene and garnet (omphacite pyrope). The protolith is typically basaltic.

A

eclogite

39
Q

Which of the following can be a protolith of an orthogneiss?

A

granite

40
Q

A cohesive and foliated fault-zone rock having 50-70% fine matrix.

A

mylonite

41
Q

Which accessory plate is usually marked with 1/4λ?

A

mica plate

42
Q

A geometric figure that shows the index of refraction and vibration direction for light passing in any direction through a material.

A

indicatrix

43
Q

The minerals that crystallize in the following crystal systems have two optic axes, except:

a. orthorhombic
b. monoclinic
c. tetragonal
d. triclinic

A

c. tetragonal

44
Q

In an indicatrix, the line perpendicular to the optic plane is called the:

A

optic normal

45
Q

The point in an interference figure corresponding to the direction of an optic axis in the crystal section.

A

melatope

46
Q

Rudite is a latin word used to describe which type of clast?

A

gravel

47
Q

In the Wentworth scale, what is teh size of very coarse sand?

A

1-2 mm

48
Q

This is a term used to describe firmly cemented coarse-grained clastics that are characterized by clasts support, and mainly composed of pebbles of gravel dimension and not more than 15% fine-grained matrix of argillaceous and clayey detritus.

A

orthoconglomerates

49
Q

Which type of sandstone contains <75% quartz, and feldspar has more than fragments of rock?

A

arkosic arenite

50
Q

A rank of coal that has a carbon content of 71-77%

A

subbituminous

Day 2: Petrology and Mineralogy (3 decks)

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