A Mn occurrence/claim/prospect located in the SW¼ sec. 12, T3N, R6E, HM, 3.5 km (2.1 miles) N of Hyampom, on National Forest land (located claim) (located about 200 yards S of the Big Rock claim). Discovered 1940. Owner Lawrence Leckrone California 1974 MRDS database stated accuracy for this location is 1,000 meters.

Mineralization is hosted in chert. Manganese ore about 12 feet in diameter occurs in a white chert body which strikes N40E and dips 55N. Chert is completely surrounded by serpentine and is regarded as a roof pendant in serpentine. The ore occurs as black coatings on light colored chert and as compact masses of black oxide. Some patches of pink rhodonite are present, which is probably the primary mineral. Local rocks include Paleozoic marine rocks, undivided, unit 9 (Western Klamath Mountains).

Analytical data results: Average grade is about 15% Mn.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

ⓘ 'Manganese Oxides'

ⓘ Rhodonite

1 valid mineral.

Detailed Mineral List:

ⓘ 'Manganese Oxides'

Colour: Black

Description: Occurs as black coatings on chert.

References:

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

ⓘ Rhodonite

Formula: CaMn₃Mn[Si₅O₁₅]

References:

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

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 9 - Silicates
ⓘ	Rhodonite	9.DK.05	CaMn₃Mn[Si₅O₁₅]
Unclassified
ⓘ	'Manganese Oxides'	-

List of minerals for each chemical element

O	Oxygen
O	ⓘ Rhodonite	CaMn₃Mn[Si₅O₁₅]
Si	Silicon
Si	ⓘ Rhodonite	CaMn₃Mn[Si₅O₁₅]
Ca	Calcium
Ca	ⓘ Rhodonite	CaMn₃Mn[Si₅O₁₅]
Mn	Manganese
Mn	ⓘ Rhodonite	CaMn₃Mn[Si₅O₁₅]

Other Databases

Link to USGS MRDS:	10033676

Other Regions, Features and Areas containing this locality

North AmericaContinent

Coast MountainsMountain Range

North America PlateTectonic Plate

Foothills-Wallowa DomainDomain
Klamouth RangeVolcanic Arc

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.

References

(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file ID #0061050016

Wilson, Ivan (1941) (July 25, 1941).

Trask, Parker Davies, Ivan F. Wilson & F.S. Simons (1943), Manganese deposits of California – a summary report: California Division Mines Bulletin 125: 196

Trask, Parker Davies (1950) Geologic description of the manganese deposits of California. California Division of Mines Bulletin 152, 378 pp.: 307, 309.

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

Quick NavTop Mineral List Other Databases Other Regions References

Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: October 15, 2026 06:07:59 Page updated: July 29, 2025 01:03:54

Go to top of page