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

Category: Volcanic glass

Type

Commons

Name origin

Locality

GPS: 38° 30' 47,65" N, 14° 57' 31,73" 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. %)
71.75
0.11

12.33
1.98
0.02
0.07
0.12
0.70
3.59
4.47
0.01

0.07
0.10

95.32



Molecular
weight
60.08
79.88

101.96
159.69
71.85
70.94
40.31
56.08
61.98
94.20
141.95

32.06
44.01





Molecular
proportion
1.1942
0.0014

0.1209
0.0124
0.0013
0.0010
0.0030
0.0125
0.0579
0.0475
0.0001

0.0022
0.0023


1
ap











0.0002


0.0001





0.0001
328.68
0.02
2
pr








0.0011







0.0022



0.0011
119.98
0.13
4
il




0.0002



0.0002











0.0002
151.75
0.03
4
ru




0.0012















0.0012
79.90
0.10
6
cc











0.0023





0.0023


0.0023
100.09
0.23
8
or



0.2847


0.0475






0.0475






0.0475
556.67
26.42
9
ab



0.3475


0.0579





0.0579







0.0579
524.46
30.38
10
an



0.0200


0.0100




0.0100








0.0100
278.21
2.79
10
c






0.0055













0.0055
101.96
0.56
13
hm







0.0124












0.0124
159.69
1.98
14
zvyšky








0.0000

0.0030
0.0000










17
hy



0.0030




0.0000

0.0030









0.0030
100.39
0.30
18
q



0.5390
















0.5390
60.08
32.38
Y: 0.6553
D: -0.5390
Mg/(Mg+Fe2+): 1.00
Total of normative wt. % 95.32

Comment

Chemical composition

-

SiO2
71.75TiO2
0.11Al2O3
12.33Fe2O3
1.98FeO
0.02MnO
0.07MgO
0.12CaO
0.70Na2O
3.59K2O
4.47P2O5
0.01H2O+
3.71CO2
0.10SO3
0.18Total
99.14Mg(Mg/Fe2+)
0.91A/CNK
1.03A/NK
1.15

-

SiO2
68.30TiO2
0.76Al2O3
14.84Fe2O3
3.42MnO
0.14MgO
0.95CaO
2.93Na2O
4.72K2O
2.28P2O5
0.16Total
98.49Mg(Mg/Fe2+)
0.33A/CNK
0.95A/NK
1.45

-

SiO2
72.78TiO2
0.32Al2O3
13.91Fe2O3
2.86MnO
0.08MgO
0.61CaO
2.16Na2O
3.00K2O
4.24P2O5
0.02Total
99.99Mg(Mg/Fe2+)
0.30A/CNK
1.03A/NK
1.46

-

SiO2
67.98TiO2
0.77Al2O3
15.24FeO
3.77MnO
0.15MgO
1.06CaO
3.01Na2O
5.32K2O
2.12P2O5
0.17Total
99.57Mg(Mg/Fe2+)
0.33A/CNK
0.92A/NK
1.38

-

SiO2
75.43TiO2
0.27Al2O3
14.58Fe2O3
1.93MnO
0.09MgO
0.36CaO
1.81Na2O
3.70K2O
2.59P2O5
0.04Total
99.61Mg(Mg/Fe2+)
0.27A/CNK
1.20A/NK
1.64