Sample 87

NavDat sample number 20606 · PHONOLITE

Sample

Sample ID	87
Rock name	PHONOLITE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS
Comment	coarsely porphyritic; phenocrysts of tabular feldspar, euhedral feldspathoids, prismoids of pyrxoene and sphene; groundmass is holocrystalline trachytic, comprising most of rock; prismoids of Na sanidine and aegirine needles along with euhedral hauyne and nepheline, needles or grains of apatite, sphene, and magnetite, and interstitial analcite and sodalite

Location

Latitude	42.7575
Longitude	-107.309
Location	Rattlesnake Hills
State / province	Wyoming

Age

Age (Ma)	Error	Min	Max	Geologic age	Dated by
38		32	44

Analyses

Whole rock

Item	Value	Std. dev.	Unit	Method
SIO2	54.35		WT%	UNKNOWN
AL2O3	20.58		WT%	UNKNOWN
FE2O3	2.57		WT%	UNKNOWN
FEO	1.22		WT%	UNKNOWN
MGO	1.44		WT%	UNKNOWN
CAO	2.78		WT%	UNKNOWN
NA2O	6.03		WT%	UNKNOWN
K2O	5.36		WT%	UNKNOWN
H2O_PLUS	4.04		WT%	UNKNOWN
H2O_MINUS	0.34		WT%	UNKNOWN
TIO2	0.34		WT%	UNKNOWN
P2O5	0		WT%	UNKNOWN
MNO	0.13		WT%	UNKNOWN
CO2	0.78		WT%	UNKNOWN
SO3	0.19		WT%	UNKNOWN
TOTAL	100.17		WT%	UNKNOWN
FEOT	3.53		WT%	UNKNOWN

References

Carey, Byrl D, Jr (1959)