Mineralogy Quiz 1 and 2 Flashcards
Crystallographic axes, Minerals Chemical formula etc.
All of these are mafic minerals except __________________.
Garnet
Forsterite
Biotite
Orthoclase
**Orthoclase **does not belong to the group
- KAlSi3O8 or K(AlSi3O8).
Orthoclase is a Felsic minerals, on the other hand, are light-colored and have a higher silica content. Orthoclase, a type of feldspar, falls into this category.
Mafic minerals are dark-colored silicate minerals rich in magnesium and iron. Examples include forsterite, biotite, and pyroxene. Plus Garnet
Forsterite - (Mg2SiO4)
Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2
Garnet - [Mg,Fe,Mn] 3Al2 (SiO4)3
The following minerals are calcium rich plagioclases except ___________.
Bytownite
Labradorite
Oligoclase
Anorthite
Oligoclase is not calcium-rich plagioclase rather it is a sodium-rich plagioclase along with Andesine and Albite
Calcium-rich plagioclase are Anorthite-Bytownite-Labradorite
Which one should not be included in the group?
Rose Quartz
Citrine
Andesine
Amethyst
Andesine is sodic-plagioclase and does not belong to quartz group of mineral (SiO2)
Which one should not be included in the group?
Octahedron
Dome
Pinacoid
Rhombic Pyramid
Octahedron does not belong to the group
- Dome, Rhombic Pyramid, and Pinacoid in crystallography, all crystal faces having similar symmetry. Those forms that enclose space are called closed forms; those that do not, open forms. The faces that comprise a form will be similar in appearance, even though of different shapes and sizes; this similarity may be evident from natural striations, etchings, or growths, or it may be apparent only after etching with acid.
- Octahedron, however, describes a crystal structure. It refers to a specific arrangement of atoms or molecules within a crystal, not the external shape.
Which one should not be included in this group of minerals.
Biotite, Muscovite, Pyroxene, Amphibole
Muscovite does not belong to the group rather it is belong in mica group or mica family along with Biotite(sillicate mineral), Lepidolite, Phlogopite
Biotite, Pyroxene, and Amphibole are Ferromagnesian (Mafic Minerals)
Cu2S is the chemical composition for ________________.
Chalcocite
Cuprite
Chalcopyrite
Covellite
CHALCOCITE - Cu2S
Cuprite (Cu2O)
Chalcopyrite (CuFeS2)
Covellite (CuS)
Introduced the Law of Constancy of Interfacial Angles.
In the law of Constancy of Interfacial Angles by Nicolas Steno, Crystals of a substance always have constant angles between corresponding faces, regardless of size or origin.
Rhombic pyramid, Rhombohedron, Tetragonal prism, Tetragonal Pyramid.
Which does not belong to the group?
Rhombohedron does not belong because it has a different base. It’s a solid with 6 faces, all identical rhombs (parallelograms with equal angles and opposite sides of equal length). It is belong to non isometric crystal forms.
Rhombic pyramid, Tetragonal prism, and Tetragonal pyramid all share a common base. These are non isometric crystal forms that has 4 faces
All these minerals are clinopyroxenes except ______________________
Augite
Enstatite
Omphacite
Jadeite
Enstitie is Orthopyroxene
The rest are Clinopyroxene (monoclinic) minerals
Andesine, Orthoclase, Bytownite, Oligoclase.
Which one should not be included in this group of minerals?
Orthoclase belongs to Alkali group K-feld pottasium rich mineral
Orthoclase is a product of discontinous series of crystallization
Bytownite, Andesine, Oligoclase are continues series plagioclase.
Select the one that should not belong to the group.
Hextetrahedron
Trapezohedron
Diploid
Pyritohedron
Trapezohedron does not belong since it is a crystal form
Hextetrahedron Diploid Pyritohedron are class of unknown mineral listing
All minerals have an ordered arrangement of atoms. True or False
SA TRUE LANG YA
Malachite is an ore of ___________________. Copper Iron Zinc Lead
Malachite is an ore of Copper
Who is the author of “De Re Metallica”.
Georgius Agricola
Olivine, Obsidian, Oligoclase, Orthoclase
Which one should not be included in the group?
OBSIDIAN IS NOT A MINERAL
- Olivine, Oligoclase, and Orthoclase are all minerals. They are naturally occurring, inorganic, solid substances with a definite chemical composition and an ordered atomic arrangement.
- Obsidian is a volcanic glass, not a mineral. It’s a natural glass formed when lava cools rapidly, preventing crystals from forming. While it can contain the same elements as some minerals, it lacks the ordered atomic structure that defines a mineral.
Fe3O4 is the chemical composition of______________
Magnetite Fe3O4
Hematite (Fe2O3)
All of these are potassium-rich feldspar minerals except _______________.
Anorthoclase
Microcline
Orthoclase
Sanidine
Anorthoclase is calcium-rich plagioclase
In ____________ crystal system the crystallographic axes are of equal length and are mutually perpendicular, occurring at right angles to one another.
Isometric
CaWO4 is the chemical composition of
Scheelite (Calcium tungsten oxide)
An _______ is a substance composed of a single kind of atom.
Element
Agate, Onyx, Carnelian, Opal
Which one does not belong to the group?
OPAL since it is part of Mineraloids
**Agate, Onyx, and Carnelian **are all varieties of chalcedony, a type of quartz (silicon dioxide). They differ in their color and banding patterns.
HgS is the chemical composition of
Cinnabar (mercury sulfide)
Choose the one that should not be in the group.
Isometric
Monoclinic
Tetragonal
Orthorhombic
MONOCLINIC
One axis (b) is different in length, and the angle between two axes (beta) is NOT 90 degrees, while the other two angles (alpha and gamma) are 90 degrees.
other systems have all angles at 90 degrees
**Isometric: **All axes are equal and perpendicular (alpha, beta, gamma = 90 degrees).
**Tetragonal: Two axes (a and b) are equal and perpendicular to the third axis (c), but the length of c can be different. All angles (alpha, beta, gamma) are 90 degrees.
**
Orthorhombic: All three axes (a, b, and c) are different in length, but all angles (alpha, beta, gamma) are 90 degrees.
Galena is an ore of ______________.
Copper
Zinc
Iron
Lead
Lead
GALENA (PbS)
Galena is the primary ore of lead, and is often mined for its silver content. It is used as a source of lead in ceramic glaze
In a __________ crystal system two of the crystallographic axes are inclined toward each other at an oblique angle; these are usually depicted as vertical. The third axis is perpendicular to the other two. The two vertical axes therefore do not intersect one another at right angles.
Monoclinic
ZnS is the chemical composition of________
Sphalerite (Zinc sulfide)
A ____________ is made up of two nonparallel crystal faces symmetrical to a plane of symmetry.
Dome
CuS is the chemical composition of ____________.
Covellite Copper sulfide
Jet, Opal, Calcite, Amber
Which one should not belong to the group?
Calcite(CaCO3)
Jet, Opal, and Amber are Mineraloids
__________ is a pair of opposite crystal faces parallel to two of the principal crystallographic axes.
Dome
Cube
Sphenoid
Pinacoid
Pinacoid
_______________ is a gangue mineral.
Sphalerite
Pyrite
Quartz
Galena
QUARTZ (SiO2)
Sphalerite: Also known as zinc blende, it’s a zinc sulfide (ZnS) mineral, a major ore of zinc.
Pyrite: Also known as fool’s gold, it’s an iron sulfide (FeS2) mineral.
Galena: The primary ore mineral for lead, it’s lead sulfide (PbS) with a distinctive metallic luster.
These minerals are all Na rich plagioclases except ______________________.
Oligoclase
Albite
Andesine
Anorthite
Anorthite is Calcium rich plagioclase in Bowen’s Reaction continous Series
Oligioclase, Andesine, & Albite are Sodium rich plagioclase
Bornite is an ore of ________________.
Copper
Lead
Zinc
Iron
COPPER (Cu)
BORNITE (Cu5FeS4)
All of these belong to the mica family except _____________.
Phlogopite
Muscovite
Actinolite
Biotite
Actinolite
is part of amphibole group of minerals
