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:
Hollofield Quarries, Baltimore Co., Maryland, USA

mindat Locality ID: 142902
mindat URL: http://www.mindat.org/loc-142902.html

Tectonic Settings:

Total number of sublocalities beneath "Hollofield Quarries, Baltimore Co., Maryland, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 39°18'18"N
Longitude: 76°47'38"W
Decimal Degree (lat, lon): 39.305,-76.793888888889

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.

Aragonite	Calcite	Clay	Nickeline	None	Not in a structural group	Pyrite	Pyroxene	Smectite-vermiculite

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 Fe H Mg O S Si

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

Structural Groups for minerals in this locality:
Aragonite Calcite Clay Nickeline None Not in a structural group Pyrite Pyroxene Smectite-vermiculite

7 IMA Minerals at location:

Aragonite ()*	Calcite ()*	Enstatite ()*	Laumontite ()*	Pyrite ()*
Pyrrhotite ()*	Vermiculite ()*

Mineral name	Structural Groups	IMA Formula	# of localities containing mineral
Aragonite ()*	Aragonite	Ca(CO₃)	3250
Calcite ()*	Calcite	Ca(CO₃)	27770
Enstatite ()*	Pyroxene	Mg₂Si₂O₆	944
Laumontite ()*	Not in a structural group	CaAl₂Si₄O₁₂·4H₂O	1271
Pyrite ()*	Pyrite	FeS₂	39462
Pyrrhotite ()*	Nickeline	Fe₇S₈	9056
Vermiculite ()*	Clay Smectite-vermiculite	Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄·8H₂O	652

No ages have been assigned to this locality yet.

All locality data graciously provided by mindat.org

All age data...