Bentley Mineral Collection

Dr. Robert (Bob) D. Bentley (1933-2021) was a Professor of Geology at Central Washington University from 1969 to 1997. This collection was donated to COCC in December 1977.

Thanks to the efforts of Kathleen Cooper, the Library's Art Lead, the collection was cleaned and put on display in 2025. You can view the collection on the main floor of the Barber Library in Bend.

Priday Plume Agates

Rocks in a variety of shapes and sizes. Plume agates are characterized by inclusions that resemble flames, feathers, flowers, or ferns.

Dark-colored plume agates with red, white, and gold flame-like instrusions.

Smaller plume agates in various colors and shapes.

Priday Plume Agate

Priday Ranch, Willowdale, Oregon

Slices of agate

Slices of agate

Priday Plume Agate Slices

Priday Ranch, Willowdale, Oregon

Jaspers

Jasper showing a range of colors - red, green, blue, beige, and browns.

Morrison Ranch Jasper

Malheur County, Owyhee River, Oregon

Polished jasper in a variety of shapes, showing striated colors in shades of of beige, gray, black, brown, and white.

Biggs Jasper

Biggs Junction, Hwy 97, Oregon

Jasper in a variety of shapes and sizes. Predominant color is brown, ranging from tan to dark brown.

Deschutes Jasper

Miller Ranch, Deschutes River, Oregon

Variety of polished Jasper stones, ranging in colors from brown and beige to a blue-ish gray to green and black.

Hart Mountain Jasper

Hart Mountain, Lake County, Oregon

Polished slices of jasper. Coloration is largely beige, with some red, blue and darker browns.

A single example showing clear layers of green, black and brown rock.

Ochoco Dam Jasper

Prineville, Oregon

Agates

Laguna Agate

Chihuahua, Mexico

Polished agates in mostly dark colors, including nearly solid black.

Polished white agates with dark inclusions that resemble ferns or corals.

Two agates; one rectangular and mottled brown and white. The other resembles a clam shell and is brown and white.

Agate

Succor Creek, Homedale, Idaho

Two polished agates with inclusions that radiate from a central point.

Agate

Mexico

3 polished pieces of agate

Agate

Nipomo, California

A large number of agate pieces, ranging in color from white to amber to darker brown.

Larger pieces of agate with amber colored intrusions.

Agate

Oregon Beaches

Smooth round polished Alaska Moonstone, ranging in colors from white to gray to amber.

Alaska Moonstone (Agate)

Oregon Beaches

Polished agate. Largely white with inclusions of gray, green and brown.

Green Moss Agate

John Day River, Grant County, Oregon

Polished white agate with lacy inclusions. One is heart shaped. Other shapes include rectangular and ovoid.

White Frost Agate (Stinking Water Plume)

Stinking Water Creek, Harney County, Oregon

White agate in a variety of shapes and sizes.

Sun Valley Agate

Carey, Idaho

Photo & display credit: Kathleen Cooper