Introduction to Mineralogy Dr. Tark Hamilton Chapter 5: Lecture 19 Minerals

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Introduction to MineralogyDr. Tark
HamiltonChapter 5 Lecture 19Minerals
Mineral Chemical Compositions

• Camosun College GEOS 250
• Lectures 930-1020 M T Th F300
• Lab 930-1220 W F300

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Pyroxene Analysis (Augite)
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Diopside CaMgSi2O6 (2/m) monoclinic Kunar,
Afghanistan
Fabreminerals
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Orthopyroxene Olivine on 2 triangular diagrams
(MgO-SiO2-FeO) Wt oxides
(Mg-Si-Fe) Atom
En
Fs
Fo
Fa
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Pyroxene Triangle (En-Wo-Fs)
Wo
Salite
Di
Hd
Augite
Pigeonite
En
Fs
Hypersthene
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Amphibole Analysis
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Basaltic Hornblende twin (100)
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Linear (Bar) Graphs of Composition
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Molecular (MgO-SiO2-FeO)
Tie lines
Silica
Pyroxene Quartz
Silica Saturation fence
Pyroxene Olivine
Periclase
Wustite
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Carbonate Triangle Mol(MgO-CaO-(FeOMnO))
Cc
Calcite group Calcite Magnesite Siderite Rhodochr
osite Smithsonite Hexagonal R3c
Tie Lines for coexisting phases
Dolomite group Dolomite Ankerite Kutnahorite Hexa
gonal R 3
Ank
Dol
Mag
Sid
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Rhodochrosite, Quartz Tetrahedrite Sweethome
Mine CO, Fabreminerals
Kristalle Crys
Py
Knut Eldjarn
Stalactites, Catamarca Argentina
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Ternary Plot Feldspar Composition
Sanidine
Solvus
Alkali Feldspars
Anorthoclase
Plagioclase
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Blue Celsian BaAl2Si2O8Franklin NJ, Peter
Cristofono 2008