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Department of Mineralogy and Petrology
Faculty of Natural Sciences
Comenius University in Bratislava

Category: Pyroclastic

Type

Commons

Name origin

Locality

GPS: 48° 14' 12" N, 19° 39' 25" E

Major minerals

Accessory minerals

Classification

 - Macro  - Classification

Colour

Structure

Granularity

Texture

Alterations

Petrographic characteristics

Usage

Literature

Photomicrographs

 - Micro 1  - Micro 2  - Micro 3  - Micro 4

Normative composition

Step of calculation
Normative minerals



SiO2
TiO2
ZrO2
Al2O3
Fe2O3
FeO
MnO
MgO
CaO
Na2O
K2O
P2O5
F
S
CO2

Total
Molar proportion of normative mineral
Molecular mass of normative mineral
Weight % of normative mineral



Oxide
(wt. %)
69.88
0.32

16.88

3.69
0.05
1.73
2.73
2.13
2.51
0.09




100.00



Molecular
weight
60.08
79.88

101.96

71.85
70.94
40.31
56.08
61.98
94.20
141.95








Molecular
proportion
1.1631
0.0039

0.1655

0.0520
0.0006
0.0430
0.0488
0.0343
0.0266
0.0006





1
ap











0.0021


0.0006





0.0021
328.68
0.21
4
il




0.0039



0.0039











0.0039
151.75
0.60
8
or



0.1598


0.0266






0.0266






0.0266
556.67
14.83
9
ab



0.2059


0.0343





0.0343







0.0343
524.46
18.00
10
an



0.0933


0.0466




0.0466








0.0466
278.21
12.98
10
c






0.0579













0.0579
101.96
5.91
14
zvyšky








0.0481

0.0430
0.0000










17
hy



0.0910




0.0481

0.0430









0.0910
117.04
10.66
18
q



0.6130
















0.6130
60.08
36.83
Y: 0.5500
D: -0.6130
Mg/(Mg+Fe2+): 0.472
Total of normative wt. % 100.00

Comment

Chemical composition

-

SiO2
62.10
TiO2
0.28
Al2O3
15.00
Fe2O3
3.64
FeO
n.a.
MnO
0.04
MgO
1.54
CaO
2.43
Na2O
1.89
K2O
2.23
P2O5
0.08
LOI
10.60
Total
99.84
Mg(Mg/Fe2+)
0.46
A/CNK
1.51
A/NK
2.72

-

SiO2
62.45
TiO2
0.14
Al2O3
14.17
Fe2O3
3.50
FeO
n.a.
MnO
0.03
MgO
1.27
CaO
1.49
Na2O
1.21
K2O
2.61
P2O5
0.02
LOI
13.00
Total
99.89
Mg(Mg/Fe2+)
0.42
A/CNK
1.88
A/NK
2.94