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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: 37° 41' 52.87" N, 15° 0' 17.92" 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. %)
48.75
1.67

17.81
1.67
8.52
0.18
5.18
10.14
3.93
1.63
0.53




100.01



Molecular
weight
60.08
79.88

101.96
159.69
71.85
70.94
40.31
56.08
61.98
94.20
141.95








Molecular
proportion
0.8114
0.0209

0.1747
0.0105
0.1211
0.0025
0.1285
0.1808
0.0634
0.0173
0.0037





1
ap











0.0124


0.0037





0.0037
328.68
1.23
4
il




0.0209



0.0209











0.0209
151.75
3.17
8
or



0.1038


0.0173






0.0173






0.0173
556.67
9.63
9
ab´



0.3804


0.0634





0.0634







0.0634
524.46
33.25
10
an



0.1879


0.0940




0.0940








0.0940
278.21
26.14
13
mt







0.0105
0.0105











0.0105
231.54
2.42
14
zvyšky








0.0898

0.1285











15
di



0.1488




0.0306

0.0438
0.0744








0.0744
229.53
17.08
17
hy´



0.1439




0.0592

0.0847









0.1439
113.36
16.31
20
ol



0.0719




0.0592

0.0847









0.0719
166.63
11.99
22
ne



0.0408


0.0102





0.0204







0.0204
284.11
5.79
22
ab



0.2582


0.0532





0.0430







0.0430
524.46
22.57
Y: 0.9649
D: 0.1534
D1: 0.0815
D2: 0.0815
Mg/(Mg+Fe2+): 0.589
Total of normative wt. % 100.01

Comment

Chemical composition

-

SiO2
48.75TiO2
1.67Al2O3
17.81Fe2O3
1.67FeO
8.52MnO
0.18MgO
5.18CaO
10.14Na2O
3.93K2O
1.63P2O5
0.53Total
100.01Mg(Mg/Fe2+)
0.52A/CNK
0.67A/NK
2.16