Bob Griffis Minerals

04/03/2026

Available.

This aesthetic specimen host a perfect, sharp, well-formed, 16 x 8 x 8 mm, silvery-black Anatase crystal, with mirror-bright faces. This doubly-terminated Anatase is perfectly placed on a small bit of matrix accented by a druse of nearly colorless quartz crystals. The extremely high luster makes the...

04/02/2026

Josh is a great field collector in Colorado, and an all round nice guy!

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04/02/2026

Available.

A large, sharp, dark-red (to nearly black) dodecahedral Almandine garnet crystal, measuring 40 x 35 x 25 mm, is perched on contrasting muscovite schist matrix, and is complemented by several smaller garnets. The larger and one of the smaller garnets has a small area of damage, but the specimen still...

01/13/2026

Grossular garnet 450 USD

Cerro de Moka, Sierra de Cruces, Municipio de Sierra Mojada, Coahuila, Mexico

This is a great specimen with a pair of large sharp, dramatic, intergrown, well-formed, lustrous, elongated crystals of ruby-red Grossular garnets to 39 x 21 x 19 mm. A few other garnets are also present. Like all these specimens, the garnets were mechanically excavated without any repairs, are in very good condition, with just a few dings present, as is normal with these specimens. A portion of one of the crystal pairs is incompletely formed showing the greenish core. The piece is exceptionally good, with very large crystals for this locality, and has nice aesthetics. It is much better than the photos show. Collected December of 1992 by Graham Sutton and Bob Griffis.

SIZE: 41 x 40 x 23 mm overall (Miniature)
Specimen Number: SC004

https://www.bobgriffis.com/specimenSC004.html

01/13/2026

Wulfenite 225 USD

Erupcion/Ahumada Mine, Los Lamentos District, Sierra de Los Lamentos, Municipio de Ahumada, Chihuahua, Mexico

Lustrous, orange and chocolate-brown, blocky Wulfenite crystals to 8 mm are massed and intergown on minor gossan matrix. Displays well from both sides. A fine specimen with great color from this classic locality. No damage.

SIZE: 37 x 39 x 20 mm overall (Miniature)

Specimen Number: RG0352

https://www.bobgriffis.com/specimenRG0352.html

01/13/2026

Wulfenite (bipyramidal) 65 USD

Erupcion/Ahumada Mine, Los Lamentos District, Sierra de Los Lamentos, Municipio de Ahumada, Chihuahua, Mexico

Elongated, tapered crystals of lustrous, orange-brown Wulfenite to 14 mm are perched on light-colored matrix. Of all the Wulfenite habits at the Los Lamentos Mine, the bipyramidal habit seen in this specimen is the rarest. Most of the pinacoid terminations are truncated. A couple of crystals are broken of at the matrix, but all the remaining crystals are in perfect condition. This very showy specimen was raised prior to 1978.

SIZE: 32 x 26 x 23 mm overall (Thumbnail)
Specimen Number: ARG2

https://www.bobgriffis.com/specimenARG2.html

01/11/2026

This fine, large (4.3 inch) Italian Barite is On Sale.
https://www.bobgriffis.com/specimenCGR-2.html

12/12/2025

Grossular garnet

Sierra de Cruces, Municipio de Sierra Mojada, Coahuila, Mexico

Lustrous, richly-colored reddish-brown crystals of Grossular garnet to 24 x 18 mm exposed on white matrix and accented with massive yellowish-green Vesuvianite. Like all these specimens, this garnet was mechanically excavated without any repairs, with some minor chipping, as is normal with these specimens. This very nice specimen was collected December of 1992 by Graham Sutton and Bob Griffis.

SIZE: 54 x 46 x 40 mm overall (Miniature)
Specimen Number: SC013

https://www.bobgriffis.com/specimenSC013.html

12/12/2025

Quartz with Arsenopyrite and Calcite

San Antonio Mine, Santa Eulalia District, Mun. de Aquiles Serdan, Chihuahua, Mexico

Clear, lustrous Quartz points to 16 mm, host several sharp crystals of Arsenopyrite to 10 mm. Scalenohedrons of white Calcite to 5 mm are perched on the Quartz, providing nice accents. This is a excellent specimen with no damage.

SIZE: 53 x 35 x 35 mm overall (Miniature)

COLLECTION: ex. Carolyn Seitz collection
Specimen Number: Q118

https://www.bobgriffis.com/specimenQ118.html

12/12/2025

Quartz (var. Amethyst)

Amatitlan, Mun. de Zumpango del Rio, Guerrero, Mexico

Attractive cluster of very clear, gemmy Quartz crystals with nice purple, amethyst phantoms, and sharp terminations. The largest Quartz is 51 x 21 x 20 mm in size. Purchased by Carolyn from Em's Gems (1999). No damage.

SIZE: 59 x 54 x 43 mm (Miniature)

COLLECTION: ex. Bob Griffis and Carolyn Seitz collections
Specimen Number: Q075

https://www.bobgriffis.com/specimenQ075.html

12/12/2025

Tennantite with Chalcopyrite on Quartz

Cobre Mine, El Cobre, Mun. de Concepción del Oro, Zacatecas, Mexico

A classic specimen from this classic locality! A large Barite crystal (81 mm long) is pseudomorphed by small white Quartz crystals to 3 mm, and richly covered with numerous shiny black Tennantite crystals to 10 mm, all perched on a k**b of similar small Quartz points with Tennantite and Chalcopyrite. A large white Quartz crystal measuring 26 mm long, partly covered by smaller Quartz crystals, provides a nice accent at the base of the pseudomorph. This attractive old specimen dates to about the mid 1960s, when this collection was assembled. No obvious damage.

SIZE: 94 x 61 x 78 mm overall (Large Cabinet)

COLLECTION: ex. Paul Edwards collection.
Specimen Number: PE1496

https://www.bobgriffis.com/specimenPE1496.html