Lecture 12: Sulfides and Halides
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44 Terms
Sulfides are a compound between ________ and a metallic element.
sulfur
Why do many sulfides have metallic or dull metallic luster?
Because they bond with partial metallic characteristics
The specific gravity of sulfides is __________ (low/high) because of metallic elements
High.
What is the most common ore source of metals?
Sulfides
What is the general formula for sulfides?
XmSn
X= Fe,Cu,Zn,Pb,Ni,Cu,Hg,Mo
What is formed when arsenic substitutes for sulfur in sulfides?
Forms sulfarsenides or arsenides
Where are sulfides found?
Magmatic and hydrothermal deposits
What type of structure do sulfides have?
Large anionic size tends to favor coordination with large cations
Sulfides are characterized by extensive _________ solutions through __________ recrystallization.
Solid; hydrothermal
What two minerals are found in sulfide solid solutions?
Pyrrhotite (Fe1-xS) and Pyrite (FeS2)
Anionic substitution occurs between ____ and ____ in place of S in Sulfides.
P and Cl
What are some characteristics of hydrothermal solutions that contain sulfides?
Acidic, saline, very reactive- causes alteration of rocks adjacent to fracture
What is the name and group name of the following?
FeS2
Pyrite
Sulfide
What is the name and group name of the following?
CuFeS2
Chalcopyrite
Sulfide
What is the name and group name of the following?
PbS
Galena
Sulfide
What is the name and group name of the following?
(Zn or Fe)S
Sphalerite
Sulfide
What is the name and group name of the following?
HgS
Cinnabar
Sulfide
What is the name and group name of the following?
AsS
Realgar
Arsenic Sulfide/Arsenide
What is the name and group name of the following?
As2S3
Orpiment
Arsenide
What is the name and group name of the following?
NaCl
Halite
Halide
What is the name and group name of the following?
CaF2
Fluorite
Halid
Pyrite generally occurs as what crystal form?
Cubic or dodecahedra with pentagons as faces or combination of three forms
What is the most common sulfide present in most rocks and deposits?
Pyrite
What is the name of a cubic, golden, yellow sulfide mineral that displays striations, metallic luster, and high hardness?
Pyrite
What is the name of the undesirable component of iron ore?
Pyrite
What sulfide mineral has an irregular fracture, metallic luster, greenish-black streak, bronze color, is easily oxidized, and can be colored with a blue-green iridescence?
Chalcopyrite
What sulfide mineral has low hardness, high density, cubic cleavage, and is a major lead ore that may contain silver?
Galena
What sulfide mineral can be black to resinous yellow, has a dark brown streak, cubic symmetry, and is mined for Zn and Cd?
Sphalerite