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

Category: Volcanic

Type

Commons

Name origin

Locality

GPS: 48° 32' 3,84" N, 18° 48' 56,16" 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. %)
72.21
0.25

13.80
2.20
0.15
0.03
0.35
1.49
3.16
4.78
0.13




98.55



Molecular
weight




















Molecular
proportion

















1
ap











0.0031


0.0009





0.0009
328.68
0.30
4
il




0.0025



0.0025











0.0025
151.75
0.38
4
ru




0.0006















0.0006
79.90
0.05
8
or



0.3045


0.0507






0.0507






0.0507
556.67
28.25
9
ab



0.3059


0.0510





0.0510







0.0510
524.46
26.74
10
an



0.0470


0.0235




0.0235








0.0235
278.21
6.54
10
c






0.0101













0.0101
101.96
1.03
13
hm







0.0137












0.0137
159.69
2.20
14
zvyšky








0.0000

0.0087
0.0000










17
hy



0.0087




0.0000

0.0087









0.0087
100.39
0.87
18
q



0.5358
















0.5358
60.08
32.19
Y: 0.6661
D: -0.5358
Mg/(Mg+Fe2+): 1.000
Total of normative wt. % 98.55

Comment

Chemical composition

-

SiO2
72.21
TiO2
0.25
Al2O3
13.80
Fe2O3
2.20
FeO
0.15
MnO
0.03
MgO
0.35
CaO
1.49
Na2O
3.16
K2O
4.78
LOI
1.13
H2O-
0.57
Total
100.25
Mg(Mg/Fe2+)
0.81
A/CNK
1.05
A/NK
1.33