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Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Unga Island, Aleutians East Borough, Alaska, USAi
Regional Level Types
Unga IslandIsland
Aleutians East BoroughBorough
AlaskaState
USACountry

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PhotosMapsSearchMineralogy
Type:
Mindat Locality ID:
285307
Long-form identifier:
mindat:1:2:285307:2
GUID (UUID V4):
0


Unga Island is an island and the largest of the Shumagin Islands.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.


Mineral List

Mineral list contains entries from the region specified including sub-localities

10 valid minerals.

Rock Types Recorded


Rock list contains entries from the region specified including sub-localities

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Arsenopyrite ?
Formula: FeAsS
Calcite
Formula: CaCO3
Chalcopyrite
Formula: CuFeS2
Galena
Formula: PbS
'K Feldspar'
'K Feldspar var. Adularia'
Formula: KAlSi3O8
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Muscovite var. Sericite
Formula: KAl2(AlSi3O10)(OH)2
Native Copper
Formula: Cu
Native Gold
Formula: Au
Pyrite
Formula: FeS2
Quartz
Formula: SiO2
Quartz var. Amethyst
Formula: SiO2
Quartz var. Chalcedony
Formula: SiO2
Sphalerite
Formula: ZnS
'Tetrahedrite Subgroup'
Formula: Cu6(Cu4C2+2)Sb4S12S

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Native Copper1.AA.05Cu
Native Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
Sphalerite2.CB.05aZnS
Chalcopyrite2.CB.10aCuFeS2
Galena2.CD.10PbS
Pyrite2.EB.05aFeS2
Arsenopyrite ?2.EB.20FeAsS
'Tetrahedrite Subgroup'2.GB.05Cu6(Cu4C2+2)Sb4S12S
Group 4 - Oxides and Hydroxides
Quartz
var. Amethyst
4.DA.05SiO2
var. Chalcedony4.DA.05SiO2
4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 9 - Silicates
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var. Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Unclassified
'K Feldspar
var. Adularia'
-KAlSi3O8
''-

List of minerals for each chemical element

HHydrogen
H MuscoviteKAl2(AlSi3O10)(OH)2
H Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
CCarbon
C CalciteCaCO3
OOxygen
O K Feldspar var. AdulariaKAlSi3O8
O Quartz var. AmethystSiO2
O CalciteCaCO3
O Quartz var. ChalcedonySiO2
O MuscoviteKAl2(AlSi3O10)(OH)2
O QuartzSiO2
O Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
AlAluminium
Al K Feldspar var. AdulariaKAlSi3O8
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
SiSilicon
Si K Feldspar var. AdulariaKAlSi3O8
Si Quartz var. AmethystSiO2
Si Quartz var. ChalcedonySiO2
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si QuartzSiO2
Si Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
SSulfur
S ArsenopyriteFeAsS
S ChalcopyriteCuFeS2
S GalenaPbS
S PyriteFeS2
S SphaleriteZnS
S Tetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
KPotassium
K K Feldspar var. AdulariaKAlSi3O8
K MuscoviteKAl2(AlSi3O10)(OH)2
K Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca CalciteCaCO3
FeIron
Fe ArsenopyriteFeAsS
Fe ChalcopyriteCuFeS2
Fe PyriteFeS2
CuCopper
Cu ChalcopyriteCuFeS2
Cu Native CopperCu
Cu Tetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
ZnZinc
Zn SphaleriteZnS
AsArsenic
As ArsenopyriteFeAsS
SbAntimony
Sb Tetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
AuGold
Au Native GoldAu
PbLead
Pb GalenaPbS

Fossils

There are 17 fossil localities from the PaleoBioDB database within this region.

These data are provided on an experimental basis and are taken from external databases. Mindat.org has no control currently over the accuracy of these data.

Occurrences17
Youngest Fossil Listed23.0 Ma (Oligocene)
Oldest Fossil Listed33.9 Ma (Oligocene)
Stratigraphic Units
UnitNo. OccurrencesAge
Stepovak1728.4 - 23.03 Ma (Cenozoic)
Fossils from RegionClick here to show the list.
Accepted NameHierarchy Age
Calyptraea
genus
Animalia : Mollusca : Gastropoda : Littorinimorpha : Calyptraeidae : Calyptraea33.9 - 23.03 Ma
Cenozoic
Brachidontes
genus
Animalia : Mollusca : Bivalvia : Mytilida : Mytilidae : Brachidontes33.9 - 23.03 Ma
Cenozoic
Ostrea
genus
Animalia : Mollusca : Bivalvia : Ostreida : Ostreidae : Ostraea33.9 - 23.03 Ma
Cenozoic
Pododesmus
genus
Animalia : Mollusca : Bivalvia : Pectinida : Anomiidae : Pododesmus33.9 - 23.03 Ma
Cenozoic
Cyclocardia
genus
Animalia : Mollusca : Bivalvia : Carditida : Carditidae : Cyclocardia33.9 - 23.03 Ma
Cenozoic
Nemocardium
genus
Animalia : Mollusca : Bivalvia : Cardiida : Cardiidae : Nemocardium33.9 - 23.03 Ma
Cenozoic
Saxidomus
genus
Animalia : Mollusca : Bivalvia : Venerida : Veneridae : Saxidomus33.9 - 23.03 Ma
Cenozoic
Solena
genus
Animalia : Mollusca : Bivalvia : Adapedonta : Solenidae : Solena33.9 - 23.03 Ma
Cenozoic
Thracia (Cetothrax) condoni
species
Animalia : Mollusca : Bivalvia : Thraciida : Thraciidae : Thracia : Thracia (Cetothrax) condoni33.9 - 23.03 Ma
Cenozoic
Chlamys ashiyaensis
species
Animalia : Mollusca : Bivalvia : Pectinida : Pectinidae : Chlamys : Chlamys ashiyaensis33.9 - 23.03 Ma
Cenozoic
Mya (Arenomya) grewingki
species
Animalia : Mollusca : Bivalvia : Pholadida : Myidae : Mya : Mya (Arenomya) grewingki28.4 - 23.03 Ma
Cenozoic
Crepidula ungana
species
Animalia : Mollusca : Gastropoda : Littorinimorpha : Calyptraeidae : Crepidula : Crepidula ungana33.9 - 23.03 Ma
Cenozoic
Papyridea harrimani
species
Animalia : Mollusca : Bivalvia : Cardiida : Cardiidae : Papyridea : Papyridea harrimani33.9 - 23.03 Ma
Cenozoic
Acila (Truncacila) shumardi
species
Animalia : Mollusca : Bivalvia : Nuculida : Nuculidae : Acila : Acila (Truncacila) shumardi33.9 - 23.03 Ma
Cenozoic
Spisula callistaeformis
species
Animalia : Mollusca : Bivalvia : Venerida : Mactridae : Spisula : Spisula callistaeformis33.9 - 23.03 Ma
Cenozoic
Fossil LocalitiesClick to show 1 fossil locality

Other Databases

Wikipedia:https://en.wikipedia.org/wiki/Unga_Island
Wikidata ID:Q1851229
GeoNames ID:5877224

Localities in this Region

Other Regions, Features and Areas that Intersect

North America PlateTectonic Plate
USA

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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