Sample No Sample Name

NavDat sample number 29600 · RHYOLITE

Sample

Sample ID	No Sample Name
Rock name	RHYOLITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS
Comment	obsidian

Location

Latitude	41.5675
Longitude	-121.685
Location	Little Glass Mountain
State / province	California
Volcanic field	Medicine Lake Highlands

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
0		0	0.01	Holocene

Analyses

Glass

Item	Value	Std. dev.	Unit	Method
SIO2	73.47		WT%	UNKNOWN
AL2O3	13.72		WT%	UNKNOWN
FE2O3	0.61		WT%	UNKNOWN
FEO	1.24		WT%	UNKNOWN
MGO	0.37		WT%	UNKNOWN
CAO	1.38		WT%	UNKNOWN
NA2O	4.21		WT%	UNKNOWN
K2O	4.27		WT%	UNKNOWN
H2O_PLUS	0.34		WT%	UNKNOWN
H2O_MINUS	0.12		WT%	UNKNOWN
TIO2	0.28		WT%	UNKNOWN
P2O5	0.22		WT%	UNKNOWN
MNO	0.02		WT%	UNKNOWN

References

Macdonald, Ray; Smith, Robert L; Thomas, John E (1992) U. S. Geological Survey Professional Paper, Report: P 1523, 214 pp., 1992