Tectonics: Active Margin (Leading Edge Of North American Plate)

Deposit: Two deposits: the upper deposit contains sporadic manganese mineralization in a siliceous zone in greenstone. The trend of the zone appears to be n. 65 w. And the dip indeterminate. The deposit is 110 feet long, 25 feet wide, and 3-1/2 feet deep. The chief manganese mineral is bementite with smaller amounts of neotocite and superficial manganese oxides. The lower deposit is a small body of manganese confined to the red argillaceous limestone. This pod is exposed to a depth of 6 feet, is 18 feet long and 15 feet wide, and appears to pinch out in depth. The trend is n. 65 w. And the dip indeterminate. Manganese minerals are essentially the same As those in the upper deposit.

Development: 12 FT ADIT.

Rock formation(s): Metchosin Volcanics
Metchosin

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

ⓘ Manganese

Mineral List

ⓘ Bementite

1 valid mineral.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

ⓘ Greenstone

ⓘ Limestone

Detailed Mineral List:

ⓘ Bementite

Formula: Mn₇Si₆O₁₅(OH)₈

References:

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 9 - Silicates
ⓘ	Bementite	9.EE.05	Mn₇Si₆O₁₅(OH)₈

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Bementite	Mn₇Si₆O₁₅(OH)₈
O	Oxygen
O	ⓘ Bementite	Mn₇Si₆O₁₅(OH)₈
Si	Silicon
Si	ⓘ Bementite	Mn₇Si₆O₁₅(OH)₈
Mn	Manganese
Mn	ⓘ Bementite	Mn₇Si₆O₁₅(OH)₈

Other Databases

Link to USGS MRDS:	10047946

Other Regions, Features and Areas containing this locality

North AmericaContinent

USA

Washington
- Olympic Mining DistrictMining District

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