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EPR 12° 50' N, East Pacific Rise, Pacific Ocean i
Regional Level Types
EPR 12° 50' N - not defined -
East Pacific Rise - not defined -
Pacific Ocean Ocean

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Latitude & Longitude (WGS84):	12° 50' South , 115° 0' West
Latitude & Longitude (decimal):	-12.83333,-115.00000
GeoHash:	G#: 3mwnzpg83

East Pacific Rise axis, near 12° 50' N.
Deep-seated opx doleritic gabbro xenoliths within ocean floor tholeiites (pillows).

Regions containing this locality

Tectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

ⓘ var: Bytownite

ⓘ var: Labradorite

ⓘ 'Clinopyroxene Subgroup'

ⓘ var: Picotite

ⓘ 'Orthopyroxene Subgroup'

5 valid minerals.

Detailed Mineral List:

Formula: Ca(Al₂Si₂O₈)

Description: - Glassy margin of pillows.

Reference: R. Hekinian et al. , Bull. Minéral. , 1985, 108, pp. 691-698.

ⓘ Anorthite var: Bytownite

Formula: (Ca,Na)[Al(Al,Si)Si₂O₈]

Description: - Glassy margin of pillows.

Reference: R. Hekinian et al. , Bull. Minéral. , 1985, 108, pp. 691-698.

ⓘ Anorthite var: Labradorite

Formula: (Ca,Na)[Al(Al,Si)Si₂O₈]

Description: - Glassy margin of pillows. - Xenolithic inner zone of pillows.

Reference: R. Hekinian et al. , Bull. Minéral. , 1985, 108, pp. 691-698.

Formula: (Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆

Description: Ca-rich augite. - Glassy margin of pillows. - Xenolithic inner zone of pillows.

Reference: R. Hekinian et al. , Bull. Minéral. , 1985, 108, pp. 691-698.

ⓘ 'Clinopyroxene Subgroup'

Reference: R. Hekinian et al. , Bull. Minéral. , 1985, 108, pp. 691-698.

Formula: MgSiO₃

Description: - Xenolithic inner zone of pillows.

Reference: R. Hekinian et al. , Bull. Minéral. , 1985, 108, pp. 691-698.

Formula: Mg₂SiO₄

Description: - Glassy margin of pillows. - Intermediate microlitic zone. - Xenolithic inner zone of pillows.

Reference: R. Hekinian et al. , Bull. Minéral. , 1985, 108, pp. 691-698.

Reference: R. Hekinian et al. , Bull. Minéral. , 1985, 108, pp. 691-698.

Formula: Fe²⁺Al₂O₄

Description: - Xenolithic inner zone of pillows.

Reference: R. Hekinian et al. , Bull. Minéral. , 1985, 108, pp. 691-698.

ⓘ Hercynite var: Picotite

Formula: (Fe,Mg)(Al,Cr)₂O₄

Description: - Xenolithic inner zone of pillows.

Reference: R. Hekinian et al. , Bull. Minéral. , 1985, 108, pp. 691-698.

ⓘ 'Orthopyroxene Subgroup'

Reference: R. Hekinian et al. , Bull. Minéral. , 1985, 108, pp. 691-698.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
ⓘ	Hercynite	4.BB.05	Fe²⁺Al₂O₄
ⓘ	var: Picotite	4.BB.05	(Fe,Mg)(Al,Cr)₂O₄
Group 9 - Silicates
ⓘ	Anorthite	9.FA.35	Ca(Al₂Si₂O₈)
ⓘ	var: Bytownite	9.FA.35	(Ca,Na)[Al(Al,Si)Si₂O₈]
ⓘ	var: Labradorite	9.FA.35	(Ca,Na)[Al(Al,Si)Si₂O₈]
ⓘ	Augite	9.DA.15	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
ⓘ	Enstatite	9.DA.05	MgSiO₃
ⓘ	Forsterite	9.AC.05	Mg₂SiO₄
Unclassified Minerals, Rocks, etc.
ⓘ	'Clinopyroxene Subgroup'	-
ⓘ	'Glass'	-
ⓘ	'Orthopyroxene Subgroup'	-

List of minerals arranged by Dana 8th Edition classification

Group 7 - MULTIPLE OXIDES
AB₂X₄
ⓘ	Hercynite	7.2.1.3	Fe²⁺Al₂O₄
Group 51 - NESOSILICATES Insular SiO₄ Groups Only
Insular SiO₄ Groups Only with all cations in octahedral [6] coordination
ⓘ	Forsterite	51.3.1.2	Mg₂SiO₄
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
ⓘ	Augite	65.1.3a.3	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
ⓘ	Enstatite	65.1.2.1	MgSiO₃
Unclassified Minerals, Mixtures, etc.
ⓘ	Anorthite	-	Ca(Al₂Si₂O₈)
ⓘ	var: Bytownite	-	(Ca,Na)[Al(Al,Si)Si₂O₈]
ⓘ	var: Labradorite	-	(Ca,Na)[Al(Al,Si)Si₂O₈]
ⓘ	'Clinopyroxene Subgroup'	-
ⓘ	'Glass'	-
ⓘ	Hercynite var: Picotite	-	(Fe,Mg)(Al,Cr)₂O₄
ⓘ	'Orthopyroxene Subgroup'	-

List of minerals for each chemical element

O	Oxygen
O	ⓘ Forsterite	Mg₂SiO₄
O	ⓘ Anorthite (var: Bytownite)	(Ca,Na)[Al(Al,Si)Si₂O₈]
O	ⓘ Anorthite (var: Labradorite)	(Ca,Na)[Al(Al,Si)Si₂O₈]
O	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
O	ⓘ Enstatite	MgSiO₃
O	ⓘ Hercynite (var: Picotite)	(Fe,Mg)(Al,Cr)₂O₄
O	ⓘ Anorthite	Ca(Al₂Si₂O₈)
O	ⓘ Hercynite	Fe²⁺Al₂O₄
Na	Sodium
Na	ⓘ Anorthite (var: Bytownite)	(Ca,Na)[Al(Al,Si)Si₂O₈]
Na	ⓘ Anorthite (var: Labradorite)	(Ca,Na)[Al(Al,Si)Si₂O₈]
Mg	Magnesium
Mg	ⓘ Forsterite	Mg₂SiO₄
Mg	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Mg	ⓘ Enstatite	MgSiO₃
Mg	ⓘ Hercynite (var: Picotite)	(Fe,Mg)(Al,Cr)₂O₄
Al	Aluminium
Al	ⓘ Anorthite (var: Bytownite)	(Ca,Na)[Al(Al,Si)Si₂O₈]
Al	ⓘ Anorthite (var: Labradorite)	(Ca,Na)[Al(Al,Si)Si₂O₈]
Al	ⓘ Hercynite (var: Picotite)	(Fe,Mg)(Al,Cr)₂O₄
Al	ⓘ Anorthite	Ca(Al₂Si₂O₈)
Al	ⓘ Hercynite	Fe²⁺Al₂O₄
Si	Silicon
Si	ⓘ Forsterite	Mg₂SiO₄
Si	ⓘ Anorthite (var: Bytownite)	(Ca,Na)[Al(Al,Si)Si₂O₈]
Si	ⓘ Anorthite (var: Labradorite)	(Ca,Na)[Al(Al,Si)Si₂O₈]
Si	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Si	ⓘ Enstatite	MgSiO₃
Si	ⓘ Anorthite	Ca(Al₂Si₂O₈)
Ca	Calcium
Ca	ⓘ Anorthite (var: Bytownite)	(Ca,Na)[Al(Al,Si)Si₂O₈]
Ca	ⓘ Anorthite (var: Labradorite)	(Ca,Na)[Al(Al,Si)Si₂O₈]
Ca	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Ca	ⓘ Anorthite	Ca(Al₂Si₂O₈)
Cr	Chromium
Cr	ⓘ Hercynite (var: Picotite)	(Fe,Mg)(Al,Cr)₂O₄
Fe	Iron
Fe	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Fe	ⓘ Hercynite (var: Picotite)	(Fe,Mg)(Al,Cr)₂O₄
Fe	ⓘ Hercynite	Fe²⁺Al₂O₄

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)

Hekinian, R., Hebert, R., Maury, R.C., and Berger, E.T. (1985) Orthopyroxene-bearing gabbroic xenoliths in basalts from the East Pacific rise axis near 12° 50' N. Bulletin de Minéralogie, 108(5), 691-698.

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