Kristal-MineralTGS7113 - 2 SKS teori

by:

Dr. hil. gendoet hartono

Semester 1, 2018-2019

SIFAT FISIK MINERAL

• SIFAT MINERAL TERHADAP SINAR

• PERAWAKAN (BENTUK KRISTAL)

• KEKERASAN DAN KELENTURAN

• BIDANG-BELAH, PARTING DAN REKAH

• DENSITAS

• SIFAT MAGNET DAN HANTARAN-LISTRIK

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

HORNBLENDA

PYROXENE

BIDANG BELAH (CLEAVAGE)

Fracture ≠ cleavageFractured quartz crystal

Cleaved calcite crystal

Irregular fracture

Only form irregular shapes

Fibrous fracture

• Forms thread-like strands

PARTING

SIFAT FISIK MINERAL

• SIFAT MINERAL TERHADAP SINAR

• PERAWAKAN (BENTUK KRISTAL)

• KEKERASAN DAN KELENTURAN

• BIDANG-BELAH, PARTING DAN REKAH

• DENSITAS

• SIFAT MAGNET DAN HANTARAN-LISTRIK

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

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)

SIFAT FISIK MINERAL

• SIFAT MINERAL TERHADAP SINAR

• PERAWAKAN (BENTUK KRISTAL)

• KEKERASAN DAN KELENTURAN

• BIDANG-BELAH, PARTING DAN REKAH

• DENSITAS

• SIFAT MAGNET DAN HANTARAN-LISTRIK

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

Radioactivity

• Give off subatomic

particles that can

be detected by a

Geiger counter.

• Exposure can be

dangerous to living

organisms.

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