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:
DeKalb Co., Georgia, USA

Oldest recorded age at locality: 309.24
Youngest recorded age at locality: 261.92

mindat Locality ID: 23909
mindat URL: http://www.mindat.org/loc-23909.html

Tectonic Settings:

Total number of sublocalities beneath "DeKalb Co., Georgia, USA": 41
Total number of bottom-level sublocalities: 37

Number of Child Localities: 26
Child Localities:
Arabia Mountain
Atlanta
Banks Quarry
Barber's Quarry
Big Ledge Quarry (Stone Mountain Grit Company No. 1)
Consolidated Quarries
Dunwoody
Fowler's Quarry
Liburn
Lithonia District
Lithonia Post Office
Lithonia Quarry
Little Stone Mountain
Norris Lake Dam
North Georgia Quarry (Crossley Quarry)
Pine Mountain Quarry (1)
Pine Mountain Quarry (2)
Pine Mountain Quarry (3)
Pine Mountain Quarry (4; Stigman Road Quarry)
Reagin Quarry
Rock Chapel Quarry (Lithonia Quarry)
Soapstone Ridge
Stone Mountain Quarry
Stone Mountain-Lithonia District
Unnamed Occurrence
Vaughn Deposit

Latitude: 33°43'1"N
Longitude: 84°7'43"W
Decimal Degree (lat, lon): 33.716944444444,-84.128611111111

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.

Allophane	Amorphous	Amphibole	Apatite	Beryl	Calcite	Chlorite	Clay	Clinozoisite	Columbite
Copper	Corundum	Diaspore	Epidote	Feldspar	Fluorite	Garnet	Kaolinite	Lazulite	Mica
Molybdenite	Natrolite	None	Pyroxene	Quartz	Rhodonite	Smectite-vermiculite	Spinel	Stibnite	Talc
Titanite	Vivianite	Zircon

Albite ()*	Allophane ()*	Almandine ()*	Ankerite ()*	Anthophyllite ()*
Beryl ()*	Calcite ()*	Chrysocolla ()*	Clinochlore ()*	Clinozoisite ()*
Cummingtonite ()*	Diopside ()*	Enstatite ()*	Epidote ()*	Erythrite ()*
Fluorapatite ()*	Fluorite ()*	Gibbsite ()*	Goethite ()*	Gold ()*
Hematite ()*	Halloysite-10Å ()*	Kaolinite ()*	Lazulite ()*	Magnetite ()*
Microcline ()*	Molybdenite ()*	Muscovite ()*	Opal ()*	Quartz ()*
Rhodonite ()*	Samarskite-(Y) ()*	Scolecite ()*	Stibnite ()*	Talc ()*
Titanite ()*	Tremolite ()*	Uranophane-α ()*	Vermiculite ()*	Xenotime-(Y) ()*
Zircon ()*	Zoisite ()*

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 As Au Be C Ca Co Cu F Fe H K Mg Mn Mo Na Nb O P S Sb Si Ti U Y Zr

Elements from minerals reported directly at this locality: Al C Ca H O Si Zr

Structural Groups for minerals in this locality:
Allophane Amorphous Amphibole Apatite Beryl Calcite Chlorite Clay Clinozoisite Columbite
Copper Corundum Diaspore Epidote Feldspar Fluorite Garnet Kaolinite Lazulite Mica
Molybdenite Natrolite None Pyroxene Quartz Rhodonite Smectite-vermiculite Spinel Stibnite Talc
Titanite Vivianite Zircon

42 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
Albite ()*	Feldspar	Na(AlSi₃O₈)			2	201431,201448	8803
Allophane ()*	Allophane	Al₂O₃(SiO₂)_1.3-2.0·2.5-3.0H₂O			1	201448	470
Almandine ()*	Garnet	Fe²⁺₃Al₂(SiO₄)₃			2	201421,201436	2353
Ankerite ()*	None	Ca(Fe²⁺,Mg)(CO₃)₂			1	201421	3092
Anthophyllite ()*	Amphibole	Mg₂Mg₅Si₈O₂₂(OH)₂			1	201446	718
Beryl ()*	Beryl	Be₃Al₂Si₆O₁₈			2	201421,201457	4286
Calcite ()*	Calcite	Ca(CO₃)	309.24	261.92	0		27770
Chrysocolla ()*	Allophane	(Cu_2-xAl_x)H_2-xSi₂O₅(OH)₄·nH₂O			1	201448	3531
Clinochlore ()*	Chlorite Clay	Mg₅Al(AlSi₃O₁₀)(OH)₈			1	201448	1756
Clinozoisite ()*	Clinozoisite Epidote	Ca₂Al₃[Si₂O₇][SiO₄]O(OH)	309.24	261.92	0		1025
Cummingtonite ()*	Amphibole	Mg₂Mg₅Si₈O₂₂(OH)₂			3	201438,201446,201448	327
Diopside ()*	Pyroxene	CaMgSi₂O₆			1	201434	4135
Enstatite ()*	Pyroxene	Mg₂Si₂O₆			1	201446	944
Epidote ()*	Epidote Clinozoisite	Ca₂(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH)			1	201431	8173
Erythrite ()*	Vivianite	Co₃(AsO₄)₂·8H₂O			1	201446	814
Fluorapatite ()*	Apatite	Ca₅(PO₄)₃F			1	201421	2740
Fluorite ()*	Fluorite	CaF₂			2	201421,201448	9617
Gibbsite ()*	None	Al(OH)₃			1	201448	504
Goethite ()*	Diaspore	FeO(OH)			1	201446	7437
Gold ()*	Copper	Au			1	201423	30554
Hematite ()*	Corundum	Fe₂O₃			1	201446	14640
Halloysite-10Å ()*	Clay Kaolinite	Al₂Si₂O₅(OH)₄·2H₂O			1	201448	62
Kaolinite ()*	Clay Kaolinite	Al₂Si₂O₅(OH)₄			1	201448	5591
Lazulite ()*	Lazulite	MgAl₂(PO₄)₂(OH)₂			1	201455	232
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄			1	201446	14899
Microcline ()*	Feldspar	K(AlSi₃O₈)			1	201448	4924
Molybdenite ()*	Molybdenite	MoS₂			3	201421,201431,201448	5800
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂			2	201448,201461	17380
Opal ()*	Amorphous	SiO₂·nH₂O			3	201452,201453,201454	2994
Quartz ()*	Quartz	SiO₂			2	201423,201448	61156
Rhodonite ()*	Rhodonite	CaMn₃Mn(Si₅O₁₅)			1	201430	969
Samarskite-(Y) ()*	Columbite	YFe³⁺Nb₂O₈			1	201448	353
Scolecite ()*	Natrolite	Ca(Si₃Al₂)O₁₀·3H₂O			2	201437,201444	390
Stibnite ()*	Stibnite	Sb₂S₃			1	201427	3418
Talc ()*	Clay Talc	Mg₃Si₄O₁₀(OH)₂			1	201446	3337
Titanite ()*	Titanite	CaTi(SiO₄)O			2	201431,201434	4899
Tremolite ()*	Amphibole	Ca₂(Mg_5.0-4.5Fe²⁺_0.0-0.5)Si₈O₂₂(OH)₂			1	201446	2562
Uranophane-α ()*	None	Ca(UO₂)₂(SiO₃OH)₂·5H₂O			4	201450,201452,201453,201454	890
Vermiculite ()*	Clay Smectite-vermiculite	Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄·8H₂O			1	201446	652
Xenotime-(Y) ()*	Zircon	Y(PO₄)			1	201448	939
Zircon ()*	Zircon	Zr(SiO₄)	309.24	261.92	0		5251
Zoisite ()*	Epidote	Ca₂Al₃[Si₂O₇][SiO₄]O(OH)			1	201452	1025

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-03805	295.94	265.94	280.94±15	Rb-Sr		biotite		71292	North Georgia Quarry (Crossley Quarry), DeKalb Co., Georgia, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-03806	301.92	261.92	281.92±20	Rb-Sr		muscovite	Muscovite	71292	North Georgia Quarry (Crossley Quarry), DeKalb Co., Georgia, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-03779	292.86	276.86	284.86±8	Rb-Sr	age of intrusion	whole rock		71325	Stone Mountain Quarry, DeKalb Co., Georgia, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-03780	292.86	276.86	284.86±8	Rb-Sr	age of intrusion	microcline	Microcline	71325	Stone Mountain Quarry, DeKalb Co., Georgia, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-03781	309.24	293.24	301.24±8	Rb-Sr	age of intrusion	plagioclase		71325	Stone Mountain Quarry, DeKalb Co., Georgia, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-03782	308.24	294.24	301.24±7	Rb-Sr	age of intrusion	biotite		71325	Stone Mountain Quarry, DeKalb Co., Georgia, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-03791	292.86	276.86	284.86±8	Rb-Sr	age of intrusion	whole rock		71325	Stone Mountain Quarry, DeKalb Co., Georgia, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-03792	292.86	276.86	284.86±8	Rb-Sr	age of intrusion	whole rock		71325	Stone Mountain Quarry, DeKalb Co., Georgia, USA	USGS-Rb-Sr	USGS-Rb-Sr

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...