To order a mineral, please contact us to enquire about the specimen(s) availability. The website is updated nearly every day, so if it is not marked “Sold”, it is most likely available for purchase. You can either send an e-mail to mike@marinmineral.com or call 415-342-1852. Along with the inventory number of the specimen(s) of interest, please provide your shipping address and preferred shipping method (see below). I will then confirm the specimen's availability status and follow-up with regard to total cost and payment methods. Please note that all pricing is in U.S. dollars; currency conversions are provided for your convenience only, and are subject to change due to currency exchange rate changes.

Minerals will be sold on a first come first served basis. Please remember to look at the measurements of the minerals before ordering as some thumbnail sized specimens are shown larger than actual size and some large specimens are pictured smaller than actual size. If you are a California resident, a sales tax of 8.50% will be added to your order.


Orders within the USA are shipped using Priority Mail through the United States Postal Service (USPS). A tracking number can be provided upon request. Shipping charges are typically $10 to $15 for most domestic orders but will be greater for heavier specimens and/or larger packages, depending on their weight and size.

Orders outside the USA are typically shipped using USPS First Class Mail. A tracking number is provided with this service. The cost for this service is typically $25 to $35 for most orders. Packages usually arrive in about 2 weeks with this service. Expedited shipping can be arranged using the USPS or FEDEX. The USPS offers Priority Mail (6-10 days for about $75) or Express Mail (for about $100). If preferred, specimens can be shipped using FEDEX.


Marin Mineral accepts credit cards, Paypal, Venmo, Zelle, and checks or money orders in U.S. dollars. All orders will ship follow receipt of payment.

Credit Cards: VISA, Mastercard, and American Express are accepted. The credit card number, expiration date, and CVV number (3-digit code on back of card) are required to process your order.

Paypal: Make payment to mike@marinmineral.com (please note that there is no "s" in the e-mail address).

Venmo: Make payment to @Michael-Keim-9

Zelle: Make payment to 415-342-1852

Checks: Personal checks are accepted and orders will ship once checks clear. Make checks out to:

Marin Mineral
P.O. Box 5256
Larkspur, CA 94939

Return Policy

If upon receipt of the minerals you are not completely satisfied, notify me of your intent to return the mineral within 10 days. Specimens must be received in the same condition as originally shipped and include all labels. Please pack and ship with the same methodology and care as they were originally shipped. I will refund your money (less the cost of shipping; merchant card fees may apply to larger orders) upon receipt of the specimen(s). We can also credit your account towards another purchase.

©2010-2018 Marin Mineral