Sample 72

NavDat sample number 20603 · PHONOLITE

Sample

Sample ID	72
Rock name	PHONOLITE
Rock type	VOLCANIC
Composition	INTERMEDIATE
Material	IGNEOUS
Comment	porphyritic; groundmass is holocrystalline trachytic; prismoids of Na sanidine and aegirine needles with lesser sphene, apatite, magnetite, nosean, and nepheline; also interstitial analcite; phenocrysts of tabular feldspar and pyroxene, elongate prisms of amphibole, hexagonal and cubic feldspathoids, and prisms of sphene

Location

Latitude	42.7516
Longitude	-107.329
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	53.95		WT%	UNKNOWN
AL2O3	18.46		WT%	UNKNOWN
FE2O3	2.66		WT%	UNKNOWN
FEO	2.35		WT%	UNKNOWN
MGO	1.68		WT%	UNKNOWN
CAO	5.63		WT%	UNKNOWN
NA2O	7.34		WT%	UNKNOWN
K2O	4.69		WT%	UNKNOWN
H2O_PLUS	1.58		WT%	UNKNOWN
H2O_MINUS	0.25		WT%	UNKNOWN
TIO2	0.72		WT%	UNKNOWN
P2O5	0.09		WT%	UNKNOWN
MNO	0.22		WT%	UNKNOWN
SO3	0.48		WT%	UNKNOWN
TOTAL	100.27		WT%	UNKNOWN
FEOT	4.74		WT%	UNKNOWN

References

Carey, Byrl D, Jr (1959)