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Guadalupe Island, Ensenada Municipality, Baja California, Mexicoi
Regional Level Types
Guadalupe IslandIsland
Ensenada MunicipalityMunicipality
Baja CaliforniaState
MexicoCountry

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Key
Latitude & Longitude (WGS84):
29° 1' 24'' North , 118° 16' 21'' West
Latitude & Longitude (decimal):
Area:
244 km2
Locality type:
Other/historical names associated with this locality:
Isla Guadalupe


Guadalupe Island is a 244 square km volcanic island located 150 miles (241 kilometers) west of the Baja California Norte's western shore (29°01′24.04 N 118°16′21.75 W). Virtually uninhabited, there may be as many as 150 people on the island at any given time, but most are confined to temporary fishing camps. The island consists of two adjacent dissected overlapping shield volcanoes, and most exposed rock consists of olivine basalt, trachyte, or their alteration products.

Vugs of epidote were apparently discovered in non-specific areas of the island in the 1960's. Little or no effort has been made to prospect or mine the area since that time. (Epidote reported from here might have really come from a different island, Isla Cedros.)

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


4 valid minerals.

Detailed Mineral List:

Diopside
Formula: CaMgSi2O6
Reference: Lherzolite nodules; visual ID of constituents by Alfredo Petrov.
Diopside var: Chromian Diopside
Formula: Ca(Mg,Cr)Si2O6
Reference: Lherzolite nodules; visual ID of constituents by Alfredo Petrov.
Enstatite
Formula: Mg2Si2O6
Reference: Lherzolite nodules; visual ID of constituents by Alfredo Petrov.
Epidote ?
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: Peninsular Range Collection - Curtis L. Wilbur
Forsterite
Formula: Mg2SiO4
Reference: Lherzolite nodules; visual ID of constituents by Alfredo Petrov.

List of minerals arranged by Strunz 10th Edition classification

Group 9 - Silicates
Diopside9.DA.15CaMgSi2O6
var: Chromian Diopside9.DA.15Ca(Mg,Cr)Si2O6
Enstatite9.DA.05Mg2Si2O6
Epidote ?9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Forsterite9.AC.05Mg2SiO4

List of minerals arranged by Dana 8th Edition classification

Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Forsterite51.3.1.2Mg2SiO4
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Epidote ?58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Diopside65.1.3a.1CaMgSi2O6
Enstatite65.1.2.1Mg2Si2O6
Unclassified Minerals, Mixtures, etc.
Diopside
var: Chromian Diopside
-Ca(Mg,Cr)Si2O6

List of minerals for each chemical element

HHydrogen
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
OOxygen
O ForsteriteMg2SiO4
O DiopsideCaMgSi2O6
O Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
O EnstatiteMg2Si2O6
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
MgMagnesium
Mg ForsteriteMg2SiO4
Mg DiopsideCaMgSi2O6
Mg Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
Mg EnstatiteMg2Si2O6
AlAluminium
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
SiSilicon
Si ForsteriteMg2SiO4
Si DiopsideCaMgSi2O6
Si Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
Si EnstatiteMg2Si2O6
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
CaCalcium
Ca DiopsideCaMgSi2O6
Ca Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
CrChromium
Cr Diopside (var: Chromian Diopside)Ca(Mg,Cr)Si2O6
FeIron
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Batiza, R. (1977) Petrology and chemistry of Guadalupe Island: An alkalic seamount on a fossil ridge crest. Geology, 5 (12), 760–764.
Larson, William (2014), personal communication.

External Links

http://en.wikipedia.org/wiki/Guadalupe_Island - General Information on Guadalupe Island

Other Regions, Features and Areas containing this locality

Pacific PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
 
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