Sunstone Knoll
Utah
sunstone (labradorite)basalt
State-designated locality · Free
Sunstone Knoll
The Utah Geological Survey publishes this low basalt knoll in Millard County south of Delta as a public collecting site for sunstone, the transparent yellowish variety of labradorite feldspar. Most stones lie scattered across the flats on the east side, running from tiny up to nearly an inch; the larger ones are rare and hide in cavities in the lava, which means a rock hammer and eye protection. Land status is mixed — a private mining claim covers part of the site, and UGS notes collectors are generously allowed to collect there — so read the postings, sign the register, and treat that permission as a courtesy rather than a right.
The card catalog
| What you can find | sunstone (labradorite), basalt |
|---|---|
| Access | State-designated locality — Free |
| Fees | Free; no fee or permit. The Utah Geological Survey asks collectors to sign the register at the entrance. |
| Season & hours | Year-round, with easy access off State Highway 257. From the west edge of Delta, 4.3 miles west on US 6/50 to Highway 257, then about 13.4 miles south to a marked entrance just before mile marker 56, then east on dirt. Spring and fall are pleasant; the flats have no shade at all in summer. |
| Kids | Family-friendly — Sunstones glitter on the ground in low sun, so children often out-spot adults here. The Utah Geological Survey warns specifically about rattlesnakes and about the active railroad you cross on the way in. |
| Official source | Utah Geological Survey, The Rockhounder |
| Last checked | Checked against its source August 16, 2026 |
Hours, fees, and access rules change. Verify with the operator or land agency before you go.
More drawers in Utah
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obsidian, snowflake obsidian, mahogany obsidian
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geodes, quartz crystals, amethyst
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smoky quartz, microcline feldspar, limonite pseudomorphs after pyrite
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topaz, pink topaz, bixbyite
Before you go
What does Sunstone Knoll cost?
Free; no fee or permit. The Utah Geological Survey asks collectors to sign the register at the entrance. Hours, fees, and access rules change. Verify with the operator or land agency before you go.
When is Sunstone Knoll open?
Year-round, with easy access off State Highway 257. From the west edge of Delta, 4.3 miles west on US 6/50 to Highway 257, then about 13.4 miles south to a marked entrance just before mile marker 56, then east on dirt. Spring and fall are pleasant; the flats have no shade at all in summer. Hours, fees, and access rules change. Verify with the operator or land agency before you go.
Is Sunstone Knoll good for kids?
Yes — Sunstone Knoll works for families. Sunstones glitter on the ground in low sun, so children often out-spot adults here. The Utah Geological Survey warns specifically about rattlesnakes and about the active railroad you cross on the way in.