Mineral Evolution Database

Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.

Mineral locality data provided by mindat.org

The Mineral Evolution database is currently under development.

The goal of this page is to present localities at which the mineral is found, and estimates of the oldest possible geologic age of the minerals at these localities.

Locality Name:
May Lake, Yosemite National Park, Mariposa Co., California, USA

Oldest recorded age at locality: 96.8
Youngest recorded age at locality: 79.2

mindat Locality ID: 209371
mindat URL: http://www.mindat.org/loc-209371.html

Tectonic Settings:

Total number of sublocalities beneath "May Lake, Yosemite National Park, Mariposa Co., California, USA": 1
Total number of bottom-level sublocalities: 1

Number of Child Localities: 1
Child Localities:
Unnamed Sillimanite Occurrence [1]

Latitude: 37°50'50"N
Longitude: 119°29'33"W
Decimal Degree (lat, lon): 37.847222222222,-119.4925

A	This mineral is Anthropogenic.
G	This mineral is directly dated.
B	This mineral is reported as having this age.
Y	This mineral is using an age reported as an element mineralization period.
O	This mineral is using an age calculated from all data at the locality.
R	The age displayed for this mineral originates from a different, non-child locality.
P	The age displayed for this mineral is the range of ages for this mineral at all of this locality's children.
	This mineral's age has not yet been recorded.

Andalusite	Clay	Corundum	Mica	None	Not in a structural group

This Mineral list contains entries from this locality, including sub-localities. Minerals in bold are reported by mindat.org as occurring directly at this locality, and do not occur at any children (sublocalities) of this locality.

Elements at this locality, including sub-localities: Al H K O Si

Elements from minerals reported directly at this locality: Al H K O Si

Structural Groups for minerals in this locality:
Andalusite Clay Corundum Mica None Not in a structural group

4 IMA Minerals at location:

Andalusite ()*	Corundum ()*	Muscovite ()*	Sillimanite ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of Sublocalities containing mineral	LOCALITY IDs, not mindat ids	# of localities containing mineral
Andalusite ()*	Andalusite	Al₂SiO₅	96.8	79.2	0		1310
Corundum ()*	Corundum	Al₂O₃	96.8	79.2	0		1797
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂	96.8	79.2	0		17380
Sillimanite ()*	Not in a structural group	Al₂SiO₅	96.8	79.2	1	163440	1516

8 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Sample Num	MinDat Locality ID	Dated Locality (Max Age)	Reference	Reference ID
NAVDAT-15933	91	86	88+3/-2	15933	209371	May Lake, Yosemite National Park, Mariposa Co., California, USA	NAVDAT	NAVDAT
NAVDAT-32522	96.8	79.2	88±8.8	32522	209371	May Lake, Yosemite National Park, Mariposa Co., California, USA	NAVDAT	NAVDAT
NAVDAT-46301	94	93	93+1/-0	46301	209371	May Lake, Yosemite National Park, Mariposa Co., California, USA	NAVDAT	NAVDAT
NAVDAT-46302	94	93	93+1/-0	46302	209371	May Lake, Yosemite National Park, Mariposa Co., California, USA	NAVDAT	NAVDAT
NAVDAT-46303	94	93	93+1/-0	46303	209371	May Lake, Yosemite National Park, Mariposa Co., California, USA	NAVDAT	NAVDAT
NAVDAT-46304	94	93	93+1/-0	46304	209371	May Lake, Yosemite National Park, Mariposa Co., California, USA	NAVDAT	NAVDAT
NAVDAT-46305	93	88.5	90.75±2.25	46305	209371	May Lake, Yosemite National Park, Mariposa Co., California, USA	NAVDAT	NAVDAT
NAVDAT-46306	93	88.5	90.75±2.25	46306	209371	May Lake, Yosemite National Park, Mariposa Co., California, USA	NAVDAT	NAVDAT

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...