ERSC 223 MIDTERM 1 Question and
answers 100% correct
minerals - correct answer ✔solid, naturally occurring, inorganic crystalline
structure with a characteristic composition and predictable physical properties
isomorphous substitution - correct answer ✔one element in a mineral is
replaced with another without changing the structure & stays the same
mineral
Berzelian Classification System - correct answer ✔native elements-single
element-sulfur, gold, silver, graphite
sulfides-S-pyrite, cinnabar, galena, sphalerite
halides-Cl, F-halite, sylvite, flourite
oxides/hydroxides-O, OH-hematite, magnetite, goethite
sulfates-SO4-gypsum, barum
carbonites-CO3-calcite, dolomite, aragonite
silicates-SiO4 & variations-quartz, olivine, orthoclase, biotite, etc.
Silicates subclasses - correct answer ✔neso, soro, cyclo, ino (single &
double chain), phyllo, tecto
, nesosilicates - correct answer ✔SiO4
-isolated tetrahedra with cations between
-olivine, zircon, garnets, staurolite, kyanite, sillimanite
sorosilicates - correct answer ✔Si2O7
-tetrahedra joined at one oxygen
-cations between
-epidote
cyclosilicates - correct answer ✔Si6O18
-silica tetrahedra are arranged in ring
-tourmaline, beryl
inosilicates (single chain) - correct answer ✔Si8O22
-cations between chains
-orthopyroxenes, clinopyroxenes,(PYROXENES) & pyroxenoids
answers 100% correct
minerals - correct answer ✔solid, naturally occurring, inorganic crystalline
structure with a characteristic composition and predictable physical properties
isomorphous substitution - correct answer ✔one element in a mineral is
replaced with another without changing the structure & stays the same
mineral
Berzelian Classification System - correct answer ✔native elements-single
element-sulfur, gold, silver, graphite
sulfides-S-pyrite, cinnabar, galena, sphalerite
halides-Cl, F-halite, sylvite, flourite
oxides/hydroxides-O, OH-hematite, magnetite, goethite
sulfates-SO4-gypsum, barum
carbonites-CO3-calcite, dolomite, aragonite
silicates-SiO4 & variations-quartz, olivine, orthoclase, biotite, etc.
Silicates subclasses - correct answer ✔neso, soro, cyclo, ino (single &
double chain), phyllo, tecto
, nesosilicates - correct answer ✔SiO4
-isolated tetrahedra with cations between
-olivine, zircon, garnets, staurolite, kyanite, sillimanite
sorosilicates - correct answer ✔Si2O7
-tetrahedra joined at one oxygen
-cations between
-epidote
cyclosilicates - correct answer ✔Si6O18
-silica tetrahedra are arranged in ring
-tourmaline, beryl
inosilicates (single chain) - correct answer ✔Si8O22
-cations between chains
-orthopyroxenes, clinopyroxenes,(PYROXENES) & pyroxenoids
