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:
Flat Ledge Quarry (Flatledge Quarry), Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA

Oldest recorded age at locality: 431.82
Youngest recorded age at locality: 419.82

mindat Locality ID: 209564
mindat URL: http://www.mindat.org/loc-209564.html

Tectonic Settings:

Total number of sublocalities beneath "Flat Ledge Quarry (Flatledge Quarry), Rockport Granite Company Quarries, Rockport, Essex Co., Massachusetts, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 42°40'3"N
Longitude: 70°37'36"W
Decimal Degree (lat, lon): 42.6675,-70.626666666667

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	Cancrinite-sodalite	Fluorite	Molybdenite	None	Quartz	Sodalite	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: Be C Ca F Fe Mo O S Si Th Zr

Elements from minerals reported directly at this locality: Be C Ca F Fe Mo O S Si Th Zr

Structural Groups for minerals in this locality:
Calcite Cancrinite-sodalite Fluorite Molybdenite None Quartz Sodalite Spinel Zircon

8 IMA Minerals at location:

Calcite ()*	Danalite ()*	Fluorite ()*	Magnetite ()*	Molybdenite ()*
Quartz ()*	Thorite ()*	Zircon ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of localities containing mineral
Calcite ()*	Calcite	Ca(CO₃)	431.82	419.82	27770
Danalite ()*	Cancrinite-sodalite Sodalite	Be₃Fe²⁺₄(SiO₄)₃S	431.82	419.82	58
Fluorite ()*	Fluorite	CaF₂	431.82	419.82	9617
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	431.82	419.82	14899
Molybdenite ()*	Molybdenite	MoS₂	431.82	419.82	5800
Quartz ()*	Quartz	SiO₂	431.82	419.82	61156
Thorite ()*	Zircon	Th(SiO₄)	431.82	419.82	1006
Zircon ()*	Zircon	Zr(SiO₄)	431.82	419.82	5251

3 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-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...