Enhydro Quartz Identification Guide
A field guide to spotting enhydro quartz, the water-trapping crystals whose moving bubbles confirm trapped ancient fluid inside.
Read the full Enhydro Quartz encyclopedia entry →
What Enhydro Quartz Looks Like
Enhydro quartz is ordinary quartz (SiO2) that contains a sealed fluid inclusion holding water (or other liquid) plus a movable gas bubble. The diagnostic feature is the bubble that visibly travels when the crystal is tilted.
- Color: usually clear/colorless, sometimes smoky, milky, or amethystine.
- Luster: vitreous.
- Transparency: the host must be transparent enough to see the inclusion.
- Habit: prismatic quartz crystals with hexagonal cross-sections, or polished points and tumbles cut to expose the cavity.
Step-by-Step Field-ID Checklist
- Find the cavity. Use a loupe and strong backlight to locate a liquid-filled void inside the clear quartz.
- Tilt slowly. Rotate the crystal; in a true enhydro the bubble migrates to the high point. A fixed bubble is just a frozen inclusion, not a working enhydro.
- Confirm it is quartz. Hexagonal prism, glassy luster, scratches glass (Mohs 7).
- Tap gently / warm in hand. Slight temperature change can make the bubble move, confirming liquid.
- Inspect the cavity walls. Natural negative-crystal cavities have flat, crystallographic faces.
Key Diagnostic Tests
- Mohs hardness: 7 (scratches glass, not scratched by a steel knife).
- Streak: white.
- Cleavage/fracture: no cleavage; conchoidal fracture.
- Specific gravity: ~2.65.
- The moving bubble is the defining test rather than any chemical one.
- No acid reaction, no magnetism.
Common Look-Alikes and How to Tell Them Apart
- Ordinary fluid-inclusion quartz: has a trapped liquid but the bubble does not move; only a mobile bubble qualifies as enhydro.
- Glass with gas bubbles: spherical fixed bubbles, mold seams, warmer to the touch, scratched by quartz; the bubble never moves through liquid.
- Enhydro agate/chalcedony: the host is microcrystalline and waxy, translucent rather than glassy and transparent, often with banding.
- Resin or acrylic novelties: much softer (scratched by a knife), lighter in hand, and may smell when warmed.
Where It Is Typically Found
Enhydro quartz crystals come from many quartz districts, with notable material from Brazil (Minas Gerais), the Himalaya (Pakistan, Nepal), Madagascar, Mexico, and Arkansas (USA). Enhydro agates and chalcedony nodules are well known from Brazil and Uruguay.
Frequently asked questions
How can you tell if quartz is a true enhydro?
Tilt the crystal under good light and watch the bubble. In a genuine enhydro the gas bubble physically moves through trapped liquid; if the bubble stays put, it is only a static fluid inclusion.
What is the water inside enhydro quartz?
It is mineral-rich water (sometimes with petroleum or carbon dioxide) sealed in the crystal as it grew, often hundreds of millions of years old. The trapped gas forms the visible moving bubble.
Enhydro quartz vs glass with bubbles: how do I tell them apart?
Glass bubbles are fixed and spherical, the material is scratched by quartz, and glass feels warmer with mold seams. Enhydro quartz scratches glass, is colder, and its bubble travels through liquid.
Can the bubble in enhydro quartz disappear?
Yes. If a crystal cracks or is cut into the cavity, the liquid can leak and the enhydro effect is lost permanently, so handle and store these crystals carefully.
Enhydro Quartz identified by the community
Recent Enhydro Quartz specimens identified with Rock Identifier.
