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Home > Geology, Rocks & Minerals > Individual Rocks: Tumbled & Rough
Spectrum carries a wide variety of rocks and minerals. Some tumbled, some rough. When you buy 10 or more of any rock you save 10% off the list price. Limited to stock on hand.
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Selenite Pieces 1-3"
Selenite Pieces 1-3"
Our Price: $0.40

Selenite is a form of gypsum whose crystal structure forms long 'rods' or fibers that are capable of transmitting light via internal reflection much like fiber optic cable. These are short (1"-3" long) pieces of selenite, good for collections or experiments.

Not that selenite can be fragile and can 'shed' sharp fibers and so should be kept out of the hands of children. Price is per piece.

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Pink Agate Stone -3/4" Tumbled
Pink Agate Stone -3/4" Tumbled
Our Price: $0.50

Tumbled pieces of pink colored agate, a variety of quartz. Approximate size: 3/4� sizes will vary.
Rose Quartz 3/4" - Tumbled
Rose Quartz 3/4" - Tumbled
Our Price: $0.50

Rose quartz is a variety of quartz that exhibits is pale pink hue due to small amounts of other minerals such as iron. Rose quartz is often used as an attractive, affordable mineral.
Carnelian Tumbled 3/4"
Carnelian Tumbled 3/4"
Our Price: $0.50

Carnelian is a form of chalcedony with a reddish brown color. Its most common use in older days was as a hot wax imprinter as wax will not stick to carnelian.
Assorted Sparkle Quartz -3/4"
Assorted Sparkle Quartz -3/4"
Our Price: $0.50

Imagine tumbled clear Quartz that has more inclusions than normal, and is tinted in different colors. That's Sparkle Quartz! Multiple colors that sparkle magnificently in the light.
Snowflake Obsidian 3/4" Tumbled
Snowflake Obsidian 3/4" Tumbled
Our Price: $0.50

Obsidian is a form of volcanic glass that has a very black color. The inclusion of small, white pieces of cristobalite form 'snowflake' patterns in the glass and offset the black color.
Amazonite 3/4" Tumbled
Amazonite 3/4" Tumbled
Our Price: $0.50

Amazonite is a form of feldspar mineral. Despite its name, it does not actually come from the Amazon River.
Blue Dalmation Stone 3/4" Tumbled
Blue Dalmation Stone 3/4" Tumbled
Our Price: $0.50

Dalmation stone is a variety of Jasper that has spots. This variety has been dyed blue for color and contrast.
Unakite - Tumbled  3/4"
Unakite - Tumbled 3/4"
Our Price: $0.50

Unakite is a 'Made in the USA' rock that is actually a combination of pink orthoclase feldspar and green epidote. The result is an interesting mix of the two colors along with a mottled appearance.
Turitella Agate - 3/4" - Tumbled
Turitella Agate - 3/4" - Tumbled
Our Price: $0.50

Turitella Agate is actually more a fossil than agate. The spots seen on the rocks are actually the fossilized shells of the gastropod E.