Sample 87-051

NavDat sample number 55952 · RHYOLITE

Sample

Sample ID	87-051
Rock name	RHYOLITE
Rock type	VOLCANIC
Composition	FELSIC
Material	IGNEOUS

Location

Latitude	46.391
Longitude	-121.959
State / province	Washington

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
21		19	23

Analyses

Whole Rock

Item	Value	Std. dev.	Unit	Method
SIO2	72.84		WT%	XRF
TIO2	0.45		WT%	XRF
AL2O3	14.04		WT%	XRF
FEO	3.12		WT%	XRF
MNO	0.05		WT%	XRF
MGO	0.2		WT%	XRF
CAO	1.3		WT%	XRF
NA2O	4.78		WT%	XRF
K2O	3.11		WT%	XRF
P2O5	0.1		WT%	XRF

References

Swanson, Donald A (1989) Geologic maps of the French Butte and Greenhorn Buttes quadrangles, Washington. Open-File Report - U. S. Geological Survey. 1989.