semester 1, 2018-2019 kristal-mineralhilghartono.dosen.sttnas.ac.id/files/2018/12/temu-ke-12.pdf ·...
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Kristal-MineralTGS7113 - 2 SKS teori
by:
Dr. hil. gendoet hartono
Semester 1, 2018-2019
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SIFAT FISIK MINERAL
• SIFAT MINERAL TERHADAP SINAR
• PERAWAKAN (BENTUK KRISTAL)
• KEKERASAN DAN KELENTURAN
• BIDANG-BELAH, PARTING DAN REKAH
• DENSITAS
• SIFAT MAGNET DAN HANTARAN-LISTRIK
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BELAHAN KEMAMPUAN MINERAL PECAH/MEMBELAH
MELALUI BIDANG DATAR/PLANAR YANG MENUNJUKKAN
KEKUATAN IKATAN-ATOM PALING LEMAH
BIDANG BELAH BIASANYA RATA, HALUS, KADANG BERKILAU
BELAHAN SEMPURNA, DISTINCT, TDK SEMPURNA, SULIT
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HORNBLENDA
PYROXENE
BIDANG BELAH (CLEAVAGE)
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Fracture ≠ cleavageFractured quartz crystal
Cleaved calcite crystal
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Irregular fracture
Only form irregular shapes
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Fibrous fracture
• Forms thread-like strands
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PARTING
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SIFAT FISIK MINERAL
• SIFAT MINERAL TERHADAP SINAR
• PERAWAKAN (BENTUK KRISTAL)
• KEKERASAN DAN KELENTURAN
• BIDANG-BELAH, PARTING DAN REKAH
• DENSITAS
• SIFAT MAGNET DAN HANTARAN-LISTRIK
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Specific Gravity/Density
All minerals have
density (mass / volume),
but some are very
dense. Examples: galena,
magnetite, and gold.
Specific gravity is the
density of the mineral
compared with the
density of water.
http://www.minerals.net/mineral/elements/gold/gold1.htm
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Quartz (2.65)
Feldspar (2.60-2.75)
Calcite (2.72)
Tourmaline (3.20)
Garnet (4.25)
ACETONE (0.79)
BROMOFORM (2.89)
METHYLENE IODIDE (3.33)
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SIFAT FISIK MINERAL
• SIFAT MINERAL TERHADAP SINAR
• PERAWAKAN (BENTUK KRISTAL)
• KEKERASAN DAN KELENTURAN
• BIDANG-BELAH, PARTING DAN REKAH
• DENSITAS
• SIFAT MAGNET DAN HANTARAN-LISTRIK
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Magnetism
Many iron minerals
will produce an
invisible magnetic
force field.
“Lodestone” acts
like a magnet.
Magnetite is
attracted to a
magnet.
http://www.minerals.net/mineral/oxides/magnetit/magneti4.htm
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Radioactivity
• Give off subatomic
particles that can
be detected by a
Geiger counter.
• Exposure can be
dangerous to living
organisms.
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... ada
pertanyaan
kah…??
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terima kasih