Protozoa agate is a form of chalcedony that has replaced biological remains, often displaying microscopic, intricate patterns characteristic of fossilized microorganisms. Collectors look for unique banding and internal structures that indicate its ancient biological origin, typically found in sedimentary formations. It is highly sought after by lapidary enthusiasts for its aesthetic, pattern-rich cabochons.
Is this protozoa agate?
5-step field checkRun through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.
- 1Test the hardnessTry to scratch protozoa agate with a known reference. Protozoa Agate sits at Mohs 6.5-7 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Protozoa Agate leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Protozoa Agate typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: brown, red, yellow, white, gray.
- 5Look at form & habitCrystal system: trigonal. Typical habit: massive.
Often confused with
Protozoa Agate vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside protozoa agate
Minerals reported to co-occur with protozoa agate. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- SiO₂
- Mohs hardness
- 6.5-7
- Density
- 2.6-2.7 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Trigonal
- Crystal habit
- Massive
- Cleavage
- None
- Rarity
- Uncommon
- Uses
- Lapidary, Collector, Decorative
- Host rock
- Sedimentary
- Typical price
- $10-100 per specimen
Where rockhounds find protozoa agate
1 mapped spotsClassic worldwide localities
- Wyoming, USA
- Montana, USA
Field-hunting tip
Look in sedimentary country — that is the host setting where protozoa agate typically forms. If you start seeing quartz, chalcedony, calcite in float, you are in the right ground. Field specimens usually show a massive habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in Iowa — start trip planning there.
Common questions
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Find protozoa agate on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
