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:
Stoneham, Middlesex Co., Massachusetts, USA

Oldest recorded age at locality: 305
Youngest recorded age at locality: 275

mindat Locality ID: 22413
mindat URL: http://www.mindat.org/loc-22413.html

Tectonic Settings:

Total number of sublocalities beneath "Stoneham, Middlesex Co., Massachusetts, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 42°28'47"N
Longitude: 71°6'"W
Decimal Degree (lat, lon): 42.479722222222,-71.1

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.

Calcite	Chalcopyrite	Clay	Clinozoisite	Epidote	Fluorite	None	Serpentine	Wollastonite

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 C Ca Cu F Fe H Mg O S Si

Elements from minerals reported directly at this locality: Al C Ca Cu F Fe H Mg O S Si

Structural Groups for minerals in this locality:
Calcite Chalcopyrite Clay Clinozoisite Epidote Fluorite None Serpentine Wollastonite

6 IMA Minerals at location:

Antigorite ()*	Calcite ()*	Chalcopyrite ()*	Epidote ()*	Fluorite ()*
Wollastonite ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of localities containing mineral
Antigorite ()*	Serpentine Clay	Mg₃Si₂O₅(OH)₄	305	275	708
Calcite ()*	Calcite	Ca(CO₃)	305	275	27770
Chalcopyrite ()*	Chalcopyrite	CuFeS₂	305	275	27198
Epidote ()*	Epidote Clinozoisite	Ca₂(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH)	305	275	8173
Fluorite ()*	Fluorite	CaF₂	305	275	9617
Wollastonite ()*	Wollastonite	CaSiO₃	305	275	1247

1 Ages assigned to this locality:

	Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Age Interpret	Prioritized?	Sample Source	Sample Num	Run Num	Age from other Locality	Dated Mineral	Minerals explicitely stated as having this age	Age applies to these Elements	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference DOI	Reference ID	Age Notes
	Alexandra-0416	305	275	290 ± 15	K-Ar	Age of basalt		whole rock							22413	Stoneham, Middlesex Co., Massachusetts, USA	Stoneham	Zartman et al. (1970)	10.1130/0016-7606(1970)81[3359:APDOKR]2.0.CO;2	GSAB81_3359

All locality data graciously provided by mindat.org

All age data...