Diagnostic Test: Board Review Flashcards
A crystal that lacks well-developed crystal faces or that has rounded or irregular form due to crowding by adjacent crystals
Anhedral
Brazil Law is a common type of twinning in which mineral?
Quartz
Atomic model which shows electrons orbit around the nucleus?
Bohr’s Model
Which of the following DOES NOT belong to the Lanthanide Series?
a. cerium
b. europium
c. ytterbium
d. uranium
d. uranium
Who classified elements based on their behaviour in a hypothetical iron alloy-silicate-sulfide-gas system?
Goldschmidt
This defect occur when an atom is displaced from the position it normally occupies to an interstitial site.
Frenkel
Which of the following is NOT a feldspathoid?
a. leucite
b. nepheline
c. sanidine
d. sodalite
c. sanidine
Which of the following minerals DOES NOT contain titanium in its chemical formula?
a. akermanite
b. ilmenite
c. rutile
d. titanite
a. akermanite
Scheelite is a mineral under which class?
tungstates
Which of the following minerals is under the scapolite group?
a. cordierite
b. heulandite
c. tridymite
d. analcime
b. heulandite
Which of the following minerals is a nesosilicate?
a. tremolite
b. enstatite
c. akermanite
d. forsterite
d. forsterite
What is the Si:O ratio of phyllosilicates?
2:5
What is the luster of sphalerite?
resinous
Very small amounts of which metal in the crystal structure of ruby gives its deep red color?
chromium
The following minerals has a streak color of shades of yellow, except:
a. orpiment
b. zincite
c. sulfur
d. chrysocolla
d. chrysocolla
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**.
phosphorescence
A variety of K-feldspar exhibit opalescence
moonstone
Term used to describe a mineral habit that is needle-like?
acicular
A term which describes a mineral of which it is capable of being drawn into a wirelike shape.
ductile
An asbestiform minerals known as a blue asbestos?
crocidolite
The silica content of basic rock is:
45-52%
This term describes a rock that is generally light in color.
leucocratic
Given: A= 20%, B= 40%, C= 10%. After normalization, the value of A becomes:
29%
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:
Quartz Monzodiorite
A phaneritic rock has an unnormalized mode of more than 90% plagioclase. This rock is classified as:
anorthosite
What is the aphanitic equivalent of syenite?
trachyte
What is the plutonic equivalent of dacite?
granodiorite
Which of the following is NOT a type of peridotite?
a. harzburgite
b. lherzolite
c. dunite
d. websterite
d. websterite
In the TAS diagram, the basaltic trachyandesite is subdivided into:
mugearite and shoshonite
A pyroclastic rock is composed of the following fragments: 20% blocks, 40% lapilli, and 40% ash. This rock is classified as:
lapilli tuff
Liparite is a synoym for the rock:
rhyolite
A medium-grained gabbro is also known as:
diabase
A diverse group of dark, porphyritic, mafic to ultramafic K-rich hypabyssal rocks.
lamprophyre
A very high degree of undercooling produces a:
glassy rock
A Rapaviki texture can be observed in:
granite
A tactite is typically formed in:
contact metamorphism
An altered basalt in which plagioclase is “albitized” as the basalts exchange Ca for Na in seawater
spilite
A green and red metamorphic rock that contains clinopyroxene and garnet (omphacite pyrope). The protolith is typically basaltic.
eclogite
Which of the following can be a protolith of an orthogneiss?
granite
A cohesive and foliated fault-zone rock having 50-70% fine matrix.
mylonite
Which accessory plate is usually marked with 1/4λ?
mica plate
A geometric figure that shows the index of refraction and vibration direction for light passing in any direction through a material.
indicatrix
The minerals that crystallize in the following crystal systems have two optic axes, except:
a. orthorhombic
b. monoclinic
c. tetragonal
d. triclinic
c. tetragonal
In an indicatrix, the line perpendicular to the optic plane is called the:
optic normal
The point in an interference figure corresponding to the direction of an optic axis in the crystal section.
melatope
Rudite is a latin word used to describe which type of clast?
gravel
In the Wentworth scale, what is teh size of very coarse sand?
1-2 mm
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.
orthoconglomerates
Which type of sandstone contains <75% quartz, and feldspar has more than fragments of rock?
arkosic arenite
A rank of coal that has a carbon content of 71-77%
subbituminous
