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:
Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA

Oldest recorded age at locality: 457
Youngest recorded age at locality: 418

mindat Locality ID: 32073
mindat URL: http://www.mindat.org/loc-32073.html

Tectonic Settings:

Total number of sublocalities beneath "Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA": 2
Total number of bottom-level sublocalities: 2

Number of Child Localities: 2
Child Localities:
Babson Farm Quarry
Flat Ledge Quarry (Flatledge Quarry)

Latitude: 42°40'42"N
Longitude: 70°37'45"W
Decimal Degree (lat, lon): 42.678333333333,-70.629166666667

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	Astrophyllite	Calcite	Cancrinite-sodalite	Corundum	Feldspar	Fluorite	Molybdenite	None	Olivine
Pyroxene	Quartz	Sodalite	Spinel	Zircon

Astrophyllite ()*	Calcite ()*	Danalite ()*	Fayalite ()*	Fluorite ()*
Grunerite ()*	Hedenbergite ()*	Hematite ()*	Ilmenite ()*	Magnetite ()*
Microcline ()*	Molybdenite ()*	Quartz ()*	Thorite ()*	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 Be C Ca F Fe H K Mo Na O S Si Th Ti Zr

Elements from minerals reported directly at this locality: F Fe H K Na O Si Ti

Structural Groups for minerals in this locality:
Amphibole Astrophyllite Calcite Cancrinite-sodalite Corundum Feldspar Fluorite Molybdenite None Olivine
Pyroxene Quartz Sodalite Spinel Zircon

15 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
Astrophyllite ()*	Astrophyllite	K₂NaFe²⁺₇Ti₂(Si₄O₁₂)₂O₂(OH)₄F	457	418	0		161
Calcite ()*	Calcite	Ca(CO₃)	431.82	419.82	1	219389	27770
Danalite ()*	Cancrinite-sodalite Sodalite	Be₃Fe²⁺₄(SiO₄)₃S	431.82	419.82	1	219389	58
Fayalite ()*	Olivine	Fe²⁺₂(SiO₄)	457	418	1	219388	371
Fluorite ()*	Fluorite	CaF₂	431.82	419.82	1	219389	9617
Grunerite ()*	Amphibole	Fe²⁺₂Fe²⁺₅Si₈O₂₂(OH)₂	457	418	0		223
Hedenbergite ()*	Pyroxene	CaFe²⁺Si₂O₆	457	418	1	219388	741
Hematite ()*	Corundum	Fe₂O₃	457	418	1	219388	14640
Ilmenite ()*	Corundum	Fe²⁺Ti⁴⁺O₃	457	418	1	219388	5433
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	457	418	2	219388,219389	14899
Microcline ()*	Feldspar	K(AlSi₃O₈)	457	418	1	219388	4924
Molybdenite ()*	Molybdenite	MoS₂	431.82	419.82	1	219389	5800
Quartz ()*	Quartz	SiO₂	457	418	2	219388,219389	61156
Thorite ()*	Zircon	Th(SiO₄)	431.82	419.82	1	219389	1006
Zircon ()*	Zircon	Zr(SiO₄)	457	418	2	219388,219389	5251

8 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Age Interpret	Sample Source	Dated Mineral	MinDat Locality ID	Dated Locality (Max Age)	Reference	Reference ID
USGS-Rb-Sr-00934	431.82	419.82	425.82±6	Rb-Sr	age of intrusion	whole rock		47041	Babson Farm Quarry, Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-00935	431.82	419.82	425.82±6	Rb-Sr	age of intrusion	whole rock		47041	Babson Farm Quarry, Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-U-Th-Pb-00150_206_238	426	418	422±4	206_238		zircon	Zircon	47041	Babson Farm Quarry, Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA	USGS-U-Th-Pb	USGS-U-Th-Pb
USGS-U-Th-Pb-00150_207_206	457	445	451±6	207_206		zircon	Zircon	47041	Babson Farm Quarry, Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA	USGS-U-Th-Pb	USGS-U-Th-Pb
USGS-U-Th-Pb-00150_207_235	431	423	427±4	207_235		zircon	Zircon	47041	Babson Farm Quarry, Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA	USGS-U-Th-Pb	USGS-U-Th-Pb
USGS-Rb-Sr-00936	431.82	419.82	425.82±6	Rb-Sr	age of intrusion	whole rock		209564	Flat Ledge Quarry (Flatledge Quarry), Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-00937	431.82	419.82	425.82±6	Rb-Sr	age of intrusion	whole rock		209564	Flat Ledge Quarry (Flatledge Quarry), Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-00938	431.82	419.82	425.82±6	Rb-Sr	age meaning uncertain (geologic factors)	whole rock		209564	Flat Ledge Quarry (Flatledge Quarry), Rockport Granite Company Quarries, Rockport, Essex 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...