Chemical and Oxygen Isotopic Composition of Roman and Late Antique Glass from Northern Greece

Table 6

Chemical compositions of chert samples, named Trd 1-2 and Trd 1-5, representative of the two mineralogical compositions identified (XRF data; LOI: loss on ignition). Note that Ga, Y, Nb, La, Ce, and U contents are not reported because they are lower than XRF detection limits for all samples (LOD of Ga = 5 ppm; LOD of Y, Nb and U = 3 ppm; LOD of La and Ce = 10 ppm).

Sample

SiO2

TiO2

Al2O3

Fe2O3

MnO

MgO

CaO

Na2O

K2O

P2O5

LOI

Sc

V

Cr

Co

Ni

Cu

Zn

Rb

Sr

Zr

Ba

Nd

Pb

Th

Number

Wt%

Wt%

Wt%

Wt%

Wt%

Wt%

Wt%

Wt%

Wt%

Wt%

Wt%

ppm

ppm

ppm

ppm

ppm

ppm

ppm

ppm

ppm

ppm

ppm

ppm

ppm

ppm

Trd 1-2

90.68

0.01

0.21

7.13

0.15

0.37

0.12

0.05

0.01

0.02

2.18

9

314

507

124

146

18

46

7

8

9

20

19

12

7

Trd 1-5

99.98

<0.005

<0.02

<0.005

<0.005

<0.02

<0.005

<0.02

<0.005

<0.005

0.00

<3

<3

<3

<3

<3

<3

<3

<3

<3

<3

<10

<10

<10

<3