Antelope Island: Garnet & Azurite Rockhounding in Davis County, Utah

Quick details

Access

Permission required

County

Davis County

State

Utah

Nearest road

Mountain View Trail

Coordinates

40.98315, -112.19767

Geology at Antelope Island

This spot sits on Farmington Canyon Complex, granitic gneiss, migmatitic, mapped as light- to pinkish-gray, weakly to strongly foliated, hornblende-bearing, quartz-feldspar gneiss with lenses of hornblende-plagioclase gneiss; intruded by widespread pegmatite dikes; unit includes a central body of weakly to moderately foliated, and red grani that formed roughly 1600 to 1000 million years ago. Plutonic rock like this weathers slowly into grus and boulders, and the most productive collecting is typically in weathered zones and drainages.

Mapped unit

Farmington Canyon Complex, granitic gneiss, migmatitic

Age

1600–1000 Ma (Mesoproterozoic)

Rock types

light- to pinkish-gray, weakly to strongly foliated, hornblende-bearing, quartz-feldspar gneiss with lenses of hornblende-plagioclase gneiss; intruded by widespread pegmatite dikes; unit includes a central body of weakly to moderately foliated, and red grani

Elevation

4,420 ft

Geologic mapping via Macrostrat and the underlying state geological survey maps (CC BY 4.0). Bedrock at the surface can vary within a mapped unit.

Best time to visit Antelope Island

Best months: March to June. Typical highs run 91°F in midsummer and 36°F in midwinter, with winter lows near 21°F.

Climate normals: NOAA 1991-2020 monthlies, FARMINGTON 3 NW station (14 mi away).

Land & collecting status

Permission required before collecting

Requires landowner or agency permission before any collecting. Do not enter without explicit authorization.

Public-land rules vary by agency, season, and field office. The RockHoundR app pulls live BLM, USFS, NPS, and tribal overlays so you can see exactly which agency manages the ground at this spot.

Sources & verification

Spot details combine the public RockHoundR location dataset, normalized mineral labels, agency land-status checks in the app, and community submissions. Coordinates are approximate until verified in the field.

State guidance last verified: April 1, 2026

• BLM Utah — Rockhounding overview
• Utah Geological Survey — collecting guidelines
• SITLA — surface use rules
• Community submissions reviewed against published agency rules

Found at Antelope Island

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

• GarnetEncyclopedia →
• AzuriteEncyclopedia →
• BiotiteEncyclopedia →
• ChloriteEncyclopedia →
• ChrysocollaEncyclopedia →
• EpidoteEncyclopedia →
• LimoniteEncyclopedia →
• MagnetiteEncyclopedia →
• MalachiteEncyclopedia →
• QuartzEncyclopedia →
• Sulfur
• Zoisite