semester 1, 2014-2015 kristal-mineralhilghartono.dosen.sttnas.ac.id/files/2018/10/temu-ke-5.pdf ·...
TRANSCRIPT
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Kristal-MineralGS1126 - 2 SKS teori
by:
Dr. hil. gendoet hartono
Semester 1, 2014-2015
Senin-jam 09.30 – 11.25
Rabu-jam 07.30 – 09.25
Kamis-jam 09.30 – 11.25
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The 7 Crystal Systems
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Crystal Systems (cont.)
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5
Sistem Monoklin
• Mempunyai satu sumbu yang
miring dari tiga sumbu yang
dimilikinya
• a b c
• a b, bc dan a c= = 90
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Cara menggambar
Ð a- / b + = 450
a : b : c = 1 : 4 : 6
Sb c adalah sumbu
terpanjang
Sb a adalah sumbu
terpendek
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Mineral Identification Basics• MONOCLINIC CRYSTALS
MONOCLINIC
In this crystal form the axes
are of unequal length.
Axes a and b are
perpendicular.
Axes b and c are
perpendicular.
But a and c make some
oblique angle and with each
other.
MONOCLINIC Crystal
Axes
a
b
c
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Mineral Identification Basics• MONOCLINIC CRYSTALS
MONOCLINIC
Crystal Model
MONOCLINIC
In this model the outside shape is the
PRISM. It looks like a distorted brick -
flattened out of shape.
Inside is the DIPYRAMID.
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Mineral Identification Basics• MONOCLINIC CRYSTALS
Gypsum Mica
Orthoclase
Top View
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Orthoclase
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13
Sistim Triklin
• mempunyai 3 sumbu
• a b a b c
•, , 90
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Cara
menggambar:
Ð a+ / c¯ = 450
Ð b- / c + = 800
a : b : c = 1 : 4 : 6
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Mineral Identification Basics• TRICLINIC CRYSTALS
TRICLINIC
In this system, all of the axes
are of different lengths and
none are perpendicular to
any of the others.
TRICLINIC Crystal
Axes
a b
c
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Mineral Identification Basics• TRICLINIC CRYSTALS
TRICLINIC Crystal
Model
TRICLINIC
Again in this model the
outside shape is the PRISM.
Located within the prism is
the DIPYRAMID.
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Mineral Identification Basics• TRICLINIC CRYSTALS
Microcline, variety Amazonite
Kyanite
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(hk0)
(0kl) (hkl)
(h0l)
Tujuh prinsip letak bidang kristal terhadap
susunan sumbu kristalografi
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(010)
(001)
(100)
Lanjutan
Tujuh prinsip letak bidang kristal terhadap
susunan sumbu kristalografi
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SIMBOL KRISTALOGRAFI
Parameter dan Parameter Rasio
Simbol Weiss dan Simbol Miller
Parameter bidang hkl
oh = 1 bagian
ok = 3 bagian
ol = 6 bagian
Parameter rasio bidang hkl
oh : ok : ol = 1 : 3 : 6
Simbol Weiss Simbol Miller
Simbol Weiss dipakai dalam penggambaran kristal ke bentuk proyeksi
orthogonal dan streografis.
Simbol Miller dipakai sebagai simbol bidang dan simbol bentuk kristal.
Panjang potongan sumbu
Satuan panjang
Satuan panjang
Panjang potongan sumbu
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oh
k
l
a+
a-
b+b-
c+
c-
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See u next week….