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

The 7 Crystal Systems

Crystal Systems (cont.)

5

Sistem Monoklin

• Mempunyai satu sumbu yang

miring dari tiga sumbu yang

dimilikinya

• a b c

• a b, bc dan a c= = 90

Cara menggambar

Ð a- / b + = 450

a : b : c = 1 : 4 : 6

Sb c adalah sumbu

terpanjang

Sb a adalah sumbu

terpendek

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

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.

Mineral Identification Basics• MONOCLINIC CRYSTALS

Gypsum Mica

Orthoclase

Top View

Orthoclase

13

Sistim Triklin

• mempunyai 3 sumbu

• a b a b c

•, , 90

Cara

menggambar:

Ð a+ / c¯ = 450

Ð b- / c + = 800

a : b : c = 1 : 4 : 6

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

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.

Mineral Identification Basics• TRICLINIC CRYSTALS

Microcline, variety Amazonite

Kyanite

(hk0)

(0kl) (hkl)

(h0l)

Tujuh prinsip letak bidang kristal terhadap

susunan sumbu kristalografi

(010)

(001)

(100)

Lanjutan

Tujuh prinsip letak bidang kristal terhadap

susunan sumbu kristalografi

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

oh

k

l

a+

a-

b+b-

c+

c-

See u next week….