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:
Millstone Hill Quarry, Worcester, Worcester Co., Massachusetts, USA

Oldest recorded age at locality: 379
Youngest recorded age at locality: 342.14

mindat Locality ID: 15191
mindat URL: http://www.mindat.org/loc-15191.html

Tectonic Settings:

Total number of sublocalities beneath "Millstone Hill Quarry, Worcester, Worcester Co., Massachusetts, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 42°16'42"N
Longitude: 71°46'52"W
Decimal Degree (lat, lon): 42.278333333333,-71.781111111111

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.

Beryl	Calcite	Fluorite	Garnet	Molybdenite	None	Pyrite	Quartz	Sphalerite	Titanite

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 Be C Ca F Fe Mo O S Si Ti Zn

Elements from minerals reported directly at this locality: Al Be C Ca F Fe Mg Mo O S Si Ti Zn

Structural Groups for minerals in this locality:
Beryl Calcite Fluorite Garnet Molybdenite None Pyrite Quartz Sphalerite Titanite

10 IMA Minerals at location:

Ankerite ()*	Beryl ()*	Calcite ()*	Fluorite ()*	Grossular ()*
Molybdenite ()*	Pyrite ()*	Quartz ()*	Sphalerite ()*	Titanite ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of localities containing mineral
Ankerite ()*	None	Ca(Fe²⁺,Mg)(CO₃)₂	379	342.14	3092
Beryl ()*	Beryl	Be₃Al₂Si₆O₁₈	379	342.14	4286
Calcite ()*	Calcite	Ca(CO₃)	379	342.14	27770
Fluorite ()*	Fluorite	CaF₂	379	342.14	9617
Grossular ()*	Garnet	Ca₃Al₂(SiO₄)₃	379	342.14	1544
Molybdenite ()*	Molybdenite	MoS₂	379	342.14	5800
Pyrite ()*	Pyrite	FeS₂	379	342.14	39462
Quartz ()*	Quartz	SiO₂	379	342.14	61156
Sphalerite ()*	Sphalerite	ZnS	379	342.14	21482
Titanite ()*	Titanite	CaTi(SiO₄)O	379	342.14	4899

5 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Age Interpret	Sample Source	MinDat Locality ID	Dated Locality (Max Age)	Reference	Reference ID
USGS-Rb-Sr-00877	372.14	342.14	357.14±15	Rb-Sr	age of intrusion	whole rock	15191	Millstone Hill Quarry, Worcester, Worcester Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-06279	379	365	372±7	Rb-Sr	age of intrusion	whole rock	15191	Millstone Hill Quarry, Worcester, Worcester Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-06280	379	365	372±7	Rb-Sr	age of intrusion	whole rock	15191	Millstone Hill Quarry, Worcester, Worcester Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-06281	379	365	372±7	Rb-Sr	age of intrusion	whole rock	15191	Millstone Hill Quarry, Worcester, Worcester Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-06282	379	365	372±7	Rb-Sr	age of intrusion	whole rock	15191	Millstone Hill Quarry, Worcester, Worcester Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...