Club	Location	Distance
Vallejo Gem & Mineral Society	Vallejo, California	19km
Contra Costa Mineral & Gem Society	Concord, California	38km
Northern California Geological Society	Orinda, California	44km
Santa Rosa Mineral And Gem Society, Inc.	Santa Rosa, California	44km
Antioch Lapidary Club	Antioch, California	49km

Mindat Locality ID:

83703

Long-form identifier:

mindat:1:2:83703:6

GUID (UUID V4):

A former pumice quarry located in sec. 24, T5N, R4W, MDM, 3.9 km (2.4 miles) SE of Napa. Previously operated by the Basalt Rock Co., Inc. This quarry was in operation from 1934 to 1946.

The plant had a capacity of 40 tons per 8-hour day.

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

ⓘ Basalt

List of minerals for each chemical element

Other Databases

Link to USGS MRDS:	10031598

Other Regions, Features and Areas containing this locality

North AmericaContinent

North America PlateTectonic Plate

California Coast RangesAccretionary Complex
Franciscan DomainDomain
Sonoma-Livermore BasinBasin

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

Davis, Fenelon Francis (1948), Mines and mineral resources of Napa County, California: California Division Mines (Report 44): 44(2): 172-173

California Division of Mines Bulletin 174 (1956): 30

USGS MRDS database (2005), loc. file ID #10031598.

Quick NavTop Rock Types 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: September 3, 2026 15:17:10 Page updated: August 9, 2025 05:35:10

Go to top of page

Basalt Rock Company Inc. Quarry, Napa, Napa County, California, USAiRegional Level TypesBasalt Rock Company Inc. QuarryQuarry Napa- not defined - Napa CountyCounty CaliforniaState USACountry function showexplain() { $("#locexplain").toggle(); if (typeof movemap === "function") movemap(); }