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:
Macomber Ledge Pegmatite Locality, Chesterfield, Hampshire Co., Massachusetts, USA

Oldest recorded age at locality: 373
Youngest recorded age at locality: 369

mindat Locality ID: 208485
mindat URL: http://www.mindat.org/loc-208485.html

Tectonic Settings:

Total number of sublocalities beneath "Macomber Ledge Pegmatite Locality, Chesterfield, Hampshire Co., Massachusetts, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 42°25'49"N
Longitude: 72°52'2"W
Decimal Degree (lat, lon): 42.430277777778,-72.867222222222

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	Clay	Feldspar	Garnet	Mica	None	Pyroxene	Quartz	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 H K Li Mn Na O Si Zr

Elements from minerals reported directly at this locality: Al Be H K Li Mn Na O Si Zr

Structural Groups for minerals in this locality:
Beryl Clay Feldspar Garnet Mica None Pyroxene Quartz Zircon

7 IMA Minerals at location:

Albite ()*	Beryl ()*	Muscovite ()*	Quartz ()*	Spessartine ()*
Spodumene ()*	Zircon ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of localities containing mineral
Albite ()*	Feldspar	Na(AlSi₃O₈)	373	369	8803
Beryl ()*	Beryl	Be₃Al₂Si₆O₁₈	373	369	4286
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂	373	369	17380
Quartz ()*	Quartz	SiO₂	373	369	61156
Spessartine ()*	Garnet	Mn²⁺₃Al₂(SiO₄)₃	373	369	1214
Spodumene ()*	Pyroxene	LiAlSi₂O₆	373	369	688
Zircon ()*	Zircon	Zr(SiO₄)	373	369	5251

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
	Bradley_2012_067	373	369	371±2	U/Pb			zircon			Yes	Zircon			5971	Clark Ledge Pegmatite Locality, Chesterfield, Hampshire Co., Massachusetts, USA	Clark Ledge	McCauley and Bradley (2014)	10.3749/canmin.52.2.183	CM52_183

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...