Elk Rock Island, Milwaukie, Clackamas County, Oregon, USAi
Regional Level Types | |
---|---|
Elk Rock Island | Island |
Milwaukie | - not defined - |
Clackamas County | County |
Oregon | State |
USA | Country |
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Latitude & Longitude (WGS84):
45° 26' 9'' North , 122° 38' 52'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Mindat Locality ID:
19926
Long-form identifier:
mindat:1:2:19926:4
GUID (UUID V4):
bf8257fa-4924-49d9-8390-d4c5709e183e
Zeolites and smectite are found in the Miocene Columbia River basalt exposed during low water along the southern and eastern sides of Elk Island in the middle of the Willamette River in Milwaukie, Clackamas County, Oregon. Minerals were first found by Gordon Gilbertson in 1975 in boulders near the island. The collecting site can only be reached during low water in the summer along with low tide that backs up the river. The most unusual mineral combination is an overgrowth of gray-green smectite that covers thin hexagonal levyne/offretite crystals forming incrustation pseudomorphs. Rudy Tschernich
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
ⓘ Analcime Formula: Na(AlSi2O6) · H2O References: |
ⓘ 'Chabazite' References: |
ⓘ 'Heulandite Subgroup' Formula: (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O References: |
ⓘ 'Lévyne' References: |
ⓘ Offretite Formula: KCaMg(Si13Al5)O36 · 15H2O References: |
ⓘ 'Smectite Group' Formula: A0.3D2-3[T4O10]Z2 · nH2O References: |
ⓘ 'Stilbite Subgroup' Formula: M6-7[Al8-9Si27-28O72] · nH2O References: |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 9 - Silicates | |||
---|---|---|---|
ⓘ | Analcime | 9.GB.05 | Na(AlSi2O6) · H2O |
ⓘ | Offretite | 9.GD.25 | KCaMg(Si13Al5)O36 · 15H2O |
Unclassified | |||
ⓘ | 'Chabazite' | - | |
ⓘ | 'Heulandite Subgroup' | - | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
ⓘ | 'Lévyne' | - | |
ⓘ | 'Stilbite Subgroup' | - | M6-7[Al8-9Si27-28O72] · nH2O |
ⓘ | 'Smectite Group' | - | A0.3D2-3[T4O10]Z2 · nH2O |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | ⓘ Analcime | Na(AlSi2O6) · H2O |
H | ⓘ Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
H | ⓘ Offretite | KCaMg(Si13Al5)O36 · 15H2O |
H | ⓘ Stilbite Subgroup | M6-7[Al8-9Si27-28O72] · nH2O |
H | ⓘ Smectite Group | A0.3D2-3[T4O10]Z2 · nH2O |
O | Oxygen | |
O | ⓘ Analcime | Na(AlSi2O6) · H2O |
O | ⓘ Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
O | ⓘ Offretite | KCaMg(Si13Al5)O36 · 15H2O |
O | ⓘ Stilbite Subgroup | M6-7[Al8-9Si27-28O72] · nH2O |
O | ⓘ Smectite Group | A0.3D2-3[T4O10]Z2 · nH2O |
Na | Sodium | |
Na | ⓘ Analcime | Na(AlSi2O6) · H2O |
Na | ⓘ Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
Mg | Magnesium | |
Mg | ⓘ Offretite | KCaMg(Si13Al5)O36 · 15H2O |
Al | Aluminium | |
Al | ⓘ Analcime | Na(AlSi2O6) · H2O |
Al | ⓘ Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
Al | ⓘ Offretite | KCaMg(Si13Al5)O36 · 15H2O |
Al | ⓘ Stilbite Subgroup | M6-7[Al8-9Si27-28O72] · nH2O |
Si | Silicon | |
Si | ⓘ Analcime | Na(AlSi2O6) · H2O |
Si | ⓘ Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
Si | ⓘ Offretite | KCaMg(Si13Al5)O36 · 15H2O |
Si | ⓘ Stilbite Subgroup | M6-7[Al8-9Si27-28O72] · nH2O |
K | Potassium | |
K | ⓘ Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
K | ⓘ Offretite | KCaMg(Si13Al5)O36 · 15H2O |
Ca | Calcium | |
Ca | ⓘ Heulandite Subgroup | (Na/Ca/K)5-6[Al8-9 Si27-28 O72] · nH2O |
Ca | ⓘ Offretite | KCaMg(Si13Al5)O36 · 15H2O |
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Siletzia DomainDomain
- Western Washington–Oregon BasinsBasin
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