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Rocky Pass, Kuiu Island, Sitka Borough, Alaska, USA

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Latitude & Longitude (WGS84): 56° 40' 38'' North , 133° 44' 20'' West
Latitude & Longitude (decimal): 56.67722,-133.73889
Köppen climate type:Cfb : Temperate oceanic climate

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Mineral List

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

9 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Oligocene - Tertiary
23.03 - 66 Ma

ID: 1636274
Admiralty Island and Cenotaph Volcanics

Age: Paleogene (23.03 - 66 Ma)

Stratigraphic Name: Admiralty Island Volcanics; Cenotaph Volcanics

Description: Basalt and other mafic extrusive rocks. Dark gray, rusty-weathering, platy, blocky, or columnar jointed flows 50 cm to several meters thick. Commonly vesicular and amygdaloidal; amygdule fillings include calcite, epidote, chalcedony, chlorite, and zeolites.

Lithology: Igneous

Reference: Wilson, F.H., Hults, C.P., Mull, C.G, and Karl, S.M. (compilers). Geologic map of Alaska. doi: 10.3133/sim3340. U.S. Geological Survey Scientific Investigations Map 3340, pamphlet 196. [21]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

Localities in this Region


This page contains all mineral locality references listed on 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 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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The Canadian Mineralogist; June 1997; v. 35; no. 3; p. 691-698

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