The Rockhound dictionary
1,043 minerals, gem varieties, rocks, fossils, meteorites, organic gems, and lapidary materials, with how to tell them apart. Shared by everyone who uses Rockhound: pick one of these names when you add a specimen, and its properties fill themselves in.
39 entries fit.
| Name | Hardness | Streak | Lustre | Colours |
|---|---|---|---|---|
| Binghamite Lapidary material · SiO2 |
6.5–7 | white | silky, vitreous | golden yellow, red, brown |
| Blue lace agate Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | pale blue, white |
| Botswana agate Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | pink, peach, grey, white, brown |
| Brazilian agate Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | grey, white, brown, red; often dyed blue, green, pink, or purple |
| Brecciated jasper Lapidary material · SiO2 |
6.5–7 | white | vitreous, dull | red, brown, with cream or grey veins |
| Bruneau jasper Lapidary material · SiO2 |
6.5–7 | white | vitreous, dull | brown, cream, red, with concentric eyes |
| Bumblebee jasper ⚠️ Lapidary material |
3–5 | vitreous, dull | yellow, orange, black, grey, white, banded | |
| Condor agate Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | red, orange, yellow, purple, white, black |
| Crazy lace agate Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | white, red, yellow, brown, grey |
| Dendritic agate Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | white, grey, colourless, with black or brown dendrites |
| Dryhead agate Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | red, orange, white, tan |
| Ellensburg blue Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | cornflower blue, sky blue |
| Enhydro agate ⚠️ Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | grey, white, translucent |
| Fairburn agate Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | red, yellow, orange, brown, black, white |
| Fire agate Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | brown with iridescent red, orange, green, gold, and blue |
| Geode Lapidary material |
vitreous, dull | grey or brown outside; quartz, amethyst, calcite, or agate inside | ||
| Holley blue agate Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | lavender, violet-blue, pale purple |
| Iris agate Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | colourless to grey; rainbow colours in light passed through |
| Jade Lapidary material |
6–7 | white | vitreous, greasy | green, white, lavender, black, yellow, brown |
| Kentucky agate Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | red, yellow, black, white, grey |
| Laguna agate Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | red, orange, pink, purple, yellow, white |
| Lake Superior agate Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | red, orange, yellow, white, grey, in bands |
| Montana agate Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | clear, grey, white, with black dendrites and red-brown stains |
| Mookaite Lapidary material |
waxy, dull | red, mauve, yellow, cream, brown, mottled | ||
| Moss agate Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | colourless or white with green, brown, or black inclusions |
| Myrickite ⚠️ Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | white, grey, with red patches |
| Ocean jasper Lapidary material |
6.5–7 | white | waxy, vitreous | green, white, pink, yellow, red, with round orbs |
| Picture jasper Lapidary material · SiO2 |
6.5–7 | white | vitreous, dull | tan, brown, cream, red, blue-grey, in scenic patterns |
| Pietersite ⚠️ Lapidary material · SiO2 |
6.5–7 | white | silky, vitreous | blue-grey, gold, brown, swirled |
| Plume agate Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | clear or white with red, yellow, black, or gold plumes |
| Polychrome jasper Lapidary material · SiO2 |
6.5–7 | white | vitreous, dull | red, brown, cream, pink, yellow, green, swirled |
| Poppy jasper Lapidary material · SiO2 |
6.5–7 | white | vitreous, dull | red, yellow, orange, brown, with round orbs |
| Red jasper Lapidary material · SiO2 |
6.5–7 | white | vitreous, dull | brick red, red-brown |
| Ruby in zoisite Lapidary material |
vitreous | green with red to pink ruby and black spots | ||
| Sagenitic agate Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | clear or white with black, brown, gold, or red needle sprays |
| Scottish agate Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | red, pink, white, grey, blue |
| Sweetwater agate Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | grey, clear, with black dendrites |
| Thunderegg Lapidary material |
dull, waxy | brown or grey outside; agate, jasper, or opal core | ||
| Tree agate Lapidary material · SiO2 |
6.5–7 | white | waxy, vitreous | white with green dendrites |
The dictionary's figures are typical ones, and specimens vary. ⚠️ marks entries with a caution (toxic, radioactive, or easily damaged): open one to see what to do.