Mineral Evolution Database

Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.

Mineral locality data provided by mindat.org

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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:
Bolsena, Viterbo Province, Lazio, Italy

Oldest recorded age at locality: 0.92
Youngest recorded age at locality: 0.03

mindat Locality ID: 286302
mindat URL: http://www.mindat.org/loc-286302.html

Tectonic Settings:

Total number of sublocalities beneath "Bolsena, Viterbo Province, Lazio, Italy": 1
Total number of bottom-level sublocalities: 1

Number of Child Localities: 1
Child Localities:
Trachyte Quarry

Latitude: 42°38'29"N
Longitude: 12°1'19"E
Decimal Degree (lat, lon): 42.641388888889,12.021944444444

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.

Feldspar	Mica	None

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 F K Mg O Si

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Feldspar Mica None

2 IMA Minerals at location:

Fluorophlogopite ()*	Sanidine ()*

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
Fluorophlogopite ()*	Mica	KMg₃(Si₃Al)O₁₀F₂	0.92	0.03	1	69274	47
Sanidine ()*	Feldspar	K(AlSi₃O₈)	0.92	0.03	1	69274	598

Locality Notes from all Ages at Locality:

Age ID	Locality Notes
Michelle_0093	Trachyte
Michelle_0093_a	Trachyte, see pg. 80, Fig. 6.
Michelle_0095	Tephritic phonolite, see pg. 80, Fig. 6.
Michelle_0096	Latite, see pg. 80, Fig. 6.
Michelle_0097	Latite, see pg. 80, Fig. 6.
Michelle_0099	Px-trachyte, see pg. 80, Fig. 6.
Michelle_0100	Leucite tephrite from what appears to be a seminary betwee Acquadependente and Onano, see pg. 80, Fig. 6.
Michelle_0101_a	Leucite basalt
Michelle_0102	Leucite trachyte, see pg. 80, Fig. 6.
Michelle_0103	Phonolitic tephrite, see pg. 80, Fig. 6.
Michelle_0104_a	Latite, see pg. 80, Fig. 6.
Michelle_0106_b	Trachyte, see pg. 80, Fig. 6.
Michelle_0107_c	Trachyte, see pg. 80, Fig. 6.
Michelle_0108_d	Trachyte, see pg. 80, Fig. 6. Dyke near Casa Gazette (Varekamp 1980)
Michelle_0109	Leucitite (dyke), see pg. 80, Fig. 6. Dyke near Casa Gazette (Varekamp 1980)
Michelle_0110	Leucite tephrite, see pg. 80, Fig. 6. From lava plateau of Benano (Varekamp 1980)
Michelle_0111	Vulsinite, see pg. 80, Fig. 6. Vulsinitic lava flow near Bolsena, Nassini Quarry (Varekamp 1980)
Michelle_0112_b	Latite, see pg. 80, Fig. 6.
Michelle_0113_b	Tephritic phonolite, see pg. 80, Fig. 6.
Michelle_0114	Tephrite, see pg. 80, Fig. 6.
Michelle_0115_a	Leucitic lava, see pg. 80, Fig. 6.
Michelle_0116	Leucite tephrite, see pg. 80, Fig. 6.
Michelle_0117	Tephritic phonolite, see pg. 80, Fig. 6.
Michelle_0118_c	Tephritic phonolite, see pg. 80, Fig. 6.
Michelle_0119_b	Tephritic phonolite, see pg. 80, Fig. 6.
Michelle_0120	Ol-trachybasalt, see pg. 80, Fig. 6.
Michelle_0121_a	Trachyte
Michelle_0122_b	Tephrite phonolite
Michelle_0123	Trachyte
Michelle_0124	Appears to be a stream or river

30 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Age Interpret	Sample Source	Sample Num	Dated Mineral	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference ID	Age Notes
Michelle_0093	0.05	0.03	0.04±0.01	K-Ar	Age of trachyte	sanidine	TSL	Sanidine	286302	Bolsena, Viterbo Province, Lazio, Italy	San Lorenzo Nuovo	Fornaseri (1985)	RDSIMF40_73	Age of trachyte
Michelle_0093_a	0.05	0.03	0.04±0.01	K-Ar	Age of trachyte	sanidine	TSL	Sanidine	286302	Bolsena, Viterbo Province, Lazio, Italy	San Lorenzo Nuovo	Fornaseri (1985)	RDSIMF40_73	Age of trachyte
Michelle_0095	0.18	0.12	0.15±0.03	K-Ar	Age of tephritic phonolite	leucite	BS26	Leucite	286302	Bolsena, Viterbo Province, Lazio, Italy	Proceno	Fornaseri (1985)	RDSIMF40_73	Age of tephritic phonolite
Michelle_0096	0.22	0.14	0.18±0.04	K-Ar	Age of latite		VS36		286302	Bolsena, Viterbo Province, Lazio, Italy	Vulci	Fornaseri (1985)	RDSIMF40_73	Age of latite
Michelle_0097	0.31	0.13	0.22±0.09	K-Ar	Age of latite		VS38		286302	Bolsena, Viterbo Province, Lazio, Italy	Trc Crognola	Fornaseri (1985)	RDSIMF40_73	Age of latite
Michelle_0099	0.24	0.2	0.22±0.02	K-Ar	Age of Px-trachyte	sanidine	S	Sanidine	286302	Bolsena, Viterbo Province, Lazio, Italy	Fgio Cercone	Fornaseri (1985)	RDSIMF40_73	Age of Px-trachyte
Michelle_0100	0.307	0.247	0.277±0.03	K-Ar	Age of Leucite tephrite	leucite	L	Leucite	286302	Bolsena, Viterbo Province, Lazio, Italy	Seminario	Fornaseri (1985)	RDSIMF40_73	Age of Leucite tephrite
Michelle_0101_a	0.27	0.27	0.27	K-Ar	Age of Leucite basalt	leucite	KA457	Leucite	286302	Bolsena, Viterbo Province, Lazio, Italy	Acquapendente	Fornaseri (1985)	RDSIMF40_73	Age of Leucite basalt
Michelle_0102	0.34	0.28	0.31±0.03	K-Ar	Age of Leucite trachyte	leucite	BS31	Leucite	286302	Bolsena, Viterbo Province, Lazio, Italy	C. Gallicella	Fornaseri (1985)	RDSIMF40_73	Age of Leucite trachyte
Michelle_0103	0.37	0.25	0.31±0.06	K-Ar	Age of Phonolitic tephrite	leucite	VF8	Leucite	286302	Bolsena, Viterbo Province, Lazio, Italy	Fle Carpine	Fornaseri (1985)	RDSIMF40_73	Age of Phonolitic tephrite
Michelle_0104_a	0.3255	0.3065	0.316±0.0095	K-Ar	Age of latite	biotite	PSQ1		286302	Bolsena, Viterbo Province, Lazio, Italy	M. Calvo	Fornaseri (1985)	RDSIMF40_73	Age of latite
Michelle_0106_b	0.33	0.33	0.33	K-Ar	Age of trachyte	sanidine	KA406	Sanidine	286302	Bolsena, Viterbo Province, Lazio, Italy	San Lorenzo Nuovo	Fornaseri (1985)	RDSIMF40_73	Age of trachyte, from CA6_342
Michelle_0107_c	0.344	0.328	0.336±0.008	K-Ar	Age of trachyte	biotite	35A		286302	Bolsena, Viterbo Province, Lazio, Italy	San Lorenzo Nuovo	Fornaseri (1985)	RDSIMF40_73	Age of trachyte, from MSGI25
Michelle_0108_d	0.37	0.31	0.34±0.03	K-Ar	Age of trachyte	leucite	T12	Leucite	286302	Bolsena, Viterbo Province, Lazio, Italy	San Lorenzo Nuovo	Fornaseri (1985)	RDSIMF40_73	Age of trachyte, from BV43_489
Michelle_0109	0.41	0.29	0.35±0.06	K-Ar	Age of dyke	leucite	T13	Leucite	286302	Bolsena, Viterbo Province, Lazio, Italy	Casa Gazzetta	Fornaseri (1985)	RDSIMF40_73	Age of leucitite dyke
Michelle_0110	0.39	0.31	0.35±0.04	K-Ar	Age of leucite tephrite	leucite	T10	Leucite	286302	Bolsena, Viterbo Province, Lazio, Italy	Benano	Fornaseri (1985)	RDSIMF40_73	Age of leucite tephrite
Michelle_0111	0.42	0.3	0.36±0.06	K-Ar	Age of vulsinite		T11		286302	Bolsena, Viterbo Province, Lazio, Italy	Bolsena (Nassini Quarry)	Fornaseri (1985)	RDSIMF40_73	Age of vulsinite
Michelle_0112_b	0.56	0.26	0.41±0.15	K-Ar	Age of trachyte		VS65		286302	Bolsena, Viterbo Province, Lazio, Italy	Monte Calvo	Fornaseri (1985)	RDSIMF40_73	Age of trachyte
Michelle_0113_b	0.43	0.39	0.41±0.02	K-Ar	Age of tephritic phonolite	leucite	BS7	Leucite	286302	Bolsena, Viterbo Province, Lazio, Italy	Acquapendente	Fornaseri (1985)	RDSIMF40_73	Age of tephritic phonolite
Michelle_0114	0.423	0.403	0.413±0.01	K-Ar	Age of tephrite		VUL2		286302	Bolsena, Viterbo Province, Lazio, Italy	F. Lente	Fornaseri (1985)	RDSIMF40_73	Age of tephrite
Michelle_0115_a	0.431	0.431	0.431	K-Ar	Age of leucitic lava	leucite	KA854	Leucite	286302	Bolsena, Viterbo Province, Lazio, Italy	C. Buonviaggio	Fornaseri (1985)	RDSIMF40_73	Age of leucitic lava
Michelle_0116	0.54	0.44	0.49±0.05	K-Ar	Age of leucite tephrite	leucite	T9	Leucite	286302	Bolsena, Viterbo Province, Lazio, Italy	Le Velette	Fornaseri (1985)	RDSIMF40_73	Age of leucite tephrite
Michelle_0117	0.61	0.57	0.59±0.02	K-Ar	Age of tephritic phonolite	leucite	BS21	Leucite	286302	Bolsena, Viterbo Province, Lazio, Italy	C. Torricella	Fornaseri (1985)	RDSIMF40_73	Age of tephritic phonolite
Michelle_0118_c	0.66	0.6	0.63±0.03	K-Ar	Age of tephritic phonolite	leucite	BS14	Leucite	286302	Bolsena, Viterbo Province, Lazio, Italy	Acquapendente	Fornaseri (1985)	RDSIMF40_73	Age of tephritic phonolite
Michelle_0119_b	0.69	0.63	0.66±0.03	K-Ar	Age of tephritic phonolite	leucite	VF5	Leucite	286302	Bolsena, Viterbo Province, Lazio, Italy	C. Buonviaggio	Fornaseri (1985)	RDSIMF40_73	Age of tephritic phonolite
Michelle_0120	0.86	0.78	0.82±0.04	K-Ar	Age of ol-trachybasalt		TA7		286302	Bolsena, Viterbo Province, Lazio, Italy	Torre Alfina	Fornaseri (1985)	RDSIMF40_73	Age of ol-trachybasalt
Michelle_0121_a	0.42	0.38	0.4±0.02	K-Ar	Age of trachyte	sanidine	VS44	Sanidine	286302	Bolsena, Viterbo Province, Lazio, Italy	La Rocca	Fornaseri (1985)	RDSIMF40_73	Age of trachyte
Michelle_0122_b	0.46	0.38	0.42±0.04	K-Ar	Age of tephritic phonolite	sanidine	VS47C	Sanidine	286302	Bolsena, Viterbo Province, Lazio, Italy	La Rocca	Fornaseri (1985)	RDSIMF40_73	Age of tephritic phonolite
Michelle_0123	0.63	0.59	0.61±0.02	K-Ar	Age of trachyte	sanidine	VS31A	Sanidine	286302	Bolsena, Viterbo Province, Lazio, Italy	Fontanile Inguatta-pagnotte	Fornaseri (1985)	RDSIMF40_73	Age of trachyte
Michelle_0124	0.92	0.84	0.88±0.04	K-Ar		sanidine	VS50	Sanidine	286302	Bolsena, Viterbo Province, Lazio, Italy	T. Arrone	Fornaseri (1985)	RDSIMF40_73

Sample	Source Locality	Reference URL
R061113	Bolsena, Viterbo Province, Lazio, Italy	https://rruff.info/R061113

All locality data graciously provided by mindat.org

All age data...