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:
Nahant, Essex Co., Massachusetts, USA

Oldest recorded age at locality: 503.6
Youngest recorded age at locality: 428.27

mindat Locality ID: 22346
mindat URL: http://www.mindat.org/loc-22346.html

Tectonic Settings:

Total number of sublocalities beneath "Nahant, Essex Co., Massachusetts, USA": 2
Total number of bottom-level sublocalities: 2

Number of Child Localities: 2
Child Localities:
Iron Mine
Saunders Ledge

Latitude: 42°25'35"N
Longitude: 70°55'10"W
Decimal Degree (lat, lon): 42.426388888889,-70.919444444444

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.

Amphibole	Andalusite	Calcite	Chalcopyrite	Clay	Clinozoisite	Epidote	Feldspar	Fluorite	Garnet
None	Prehnite	Pyrite	Pyroxene	Quartz	Rocksalt	Serpentine	Spinel	Zircon

Actinolite ()*	Andalusite ()*	Anorthite ()*	Augite ()*	Calcite ()*
Chalcopyrite ()*	Clinozoisite ()*	Diopside ()*	Dolomite ()*	Epidote ()*
Fluorite ()*	Galena ()*	Grossular ()*	Lizardite ()*	Magnetite ()*
Pigeonite ()*	Prehnite ()*	Pyrite ()*	Quartz ()*	Spinel ()*
Zircon ()*

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 Pb S Si Zr

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

Structural Groups for minerals in this locality:
Amphibole Andalusite Calcite Chalcopyrite Clay Clinozoisite Epidote Feldspar Fluorite Garnet
None Prehnite Pyrite Pyroxene Quartz Rocksalt Serpentine Spinel Zircon

21 IMA Minerals at location:

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
Actinolite ()*	Amphibole	Ca₂(Mg_4.5-2.5Fe²⁺_0.5-2.5)Si₈O₂₂(OH)₂	503.6	428.27	0		3419
Andalusite ()*	Andalusite	Al₂SiO₅	503.6	428.27	0		1310
Anorthite ()*	Feldspar	Ca(Al₂Si₂O₈)	503.6	428.27	0		1036
Augite ()*	Pyroxene	(Ca,Mg,Fe)₂Si₂O₆	503.6	428.27	0		2060
Calcite ()*	Calcite	Ca(CO₃)	503.6	428.27	1	219359	27770
Chalcopyrite ()*	Chalcopyrite	CuFeS₂	503.6	428.27	0		27198
Clinozoisite ()*	Clinozoisite Epidote	Ca₂Al₃[Si₂O₇][SiO₄]O(OH)	503.6	428.27	0		1025
Diopside ()*	Pyroxene	CaMgSi₂O₆	503.6	428.27	0		4135
Dolomite ()*	None	CaMg(CO₃)₂	503.6	428.27	0		9895
Epidote ()*	Epidote Clinozoisite	Ca₂(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH)	503.6	428.27	0		8173
Fluorite ()*	Fluorite	CaF₂	503.6	428.27	0		9617
Galena ()*	Rocksalt	PbS	503.6	428.27	0		24243
Grossular ()*	Garnet	Ca₃Al₂(SiO₄)₃	503.6	428.27	0		1544
Lizardite ()*	Serpentine Clay	Mg₃Si₂O₅(OH)₄	503.6	428.27	0		359
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	503.6	428.27	0		14899
Pigeonite ()*	Pyroxene	(Mg,Fe,Ca)₂Si₂O₆	503.6	428.27	0		303
Prehnite ()*	Prehnite	Ca₂Al(Si₃Al)O₁₀(OH)₂	503.6	428.27	1	219359	1898
Pyrite ()*	Pyrite	FeS₂	503.6	428.27	0		39462
Quartz ()*	Quartz	SiO₂	503.6	428.27	0		61156
Spinel ()*	Spinel	MgAl₂O₄	503.6	428.27	0		1934
Zircon ()*	Zircon	Zr(SiO₄)	503.6	428.27	0		5251

2 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
	USGS-Rb-Sr-00950	474.27	428.27	451.27±23	Rb-Sr	minimum age of intrusion		biotite							22346	Nahant, Essex Co., Massachusetts, USA		USGS-Rb-Sr		USGS-Rb-Sr
	USGS-Rb-Sr-00951	503.6	461.6	482.6±21	Rb-Sr	age of intrusion		biotite							22346	Nahant, Essex Co., Massachusetts, USA		USGS-Rb-Sr		USGS-Rb-Sr

Sample	Source Locality	Reference URL
R040092	Nahant, Essex Co., Massachusetts, USA	https://rruff.info/R040092

All locality data graciously provided by mindat.org

All age data...