Uvite
Uvite is a calcium-rich member of the tourmaline group, usually forming dark green to brown, striated prismatic crystals in metamorphic rocks and skarns. Its most useful identifying trait is the lengthwise grooving on a trigonal prism combined with hardness of 7 to 7.5. Crystal traditions associate it with grounding and the Root and Heart Chakras.
Most commonly confused with
- Dravite: Dravite is also a brown tourmaline, but uvite is calcium-rich and is often associated with carbonate-rich metamorphic rocks.
- Schorl: Schorl is usually black and iron-rich, while uvite is commonly dark green to brown and calcium-rich.
- Elbaite: Elbaite commonly shows brighter gem colors, while uvite is more often dark green, brown, or blackish.
- Grossular: Grossular garnet may be green or brown but lacks tourmaline’s typical striated prismatic crystal habit.
Uvite vs. Similar Dark Minerals
| Feature | Uvite | Common Lookalike |
|---|---|---|
| Mineral group | Tourmaline group | Garnet, vesuvianite, or other tourmaline may be mistaken for it |
| Typical color | Dark green, brown, blackish green, reddish brown | Schorl is usually black; elbaite is often brighter |
| Crystal habit | Short prismatic, trigonal, sometimes rounded tourmaline crystals | Garnet is commonly dodecahedral; vesuvianite is often tetragonal |
| Hardness | About 7–7.5 Mohs | Many lookalikes overlap, so hardness alone is not decisive |
| Best confirmation | Chemistry, refractive index, crystal habit, and locality together | Color-only identification is unreliable |
How to Check Uvite Authenticity
Authentic uvite is usually sold as a mineral specimen rather than a mass-market tumbled stone. Check for natural tourmaline-style striations, a believable matrix association, and a locality that is known for uvite or calcium-rich tourmalines. Be cautious with vague labels such as “green tourmaline” when the seller does not provide a locality or species basis.
Helpful Locality Clues for Uvite
Uvite is commonly associated with calcium-rich metamorphic environments, especially rocks affected by contact metamorphism or carbonate-bearing settings. Locality information can be important because dark tourmalines are difficult to separate visually. A specimen from a known uvite locality is easier to evaluate than an unlabeled dark green tourmaline.
What to Photograph for Uvite Identification
Use sharp, well-lit photos that show the whole specimen, close-up crystal faces, terminations, and any matrix minerals. Include a ruler or coin for scale and capture the crystal from several angles. If available, add locality, label text, and whether the crystal is transparent, translucent, or opaque.
What Is Uvite?
Uvite is a calcium-rich tourmaline species in the tourmaline group, and it usually turns up as striated prismatic crystals in metamorphic rocks and skarns.
A piece of uvite feels noticeably heavier than quartz, though not as dense as galena. Specimens commonly range from dark green to nearly black, and the crystal faces show the lengthwise striations typical of tourmaline. Sharp edges under a strong lamp can show a bottle-green flash, but much material looks simply dark until it is tilted to the right angle.
Uvite is often mistaken for dravite or schorl at first glance because the color ranges overlap. It tends to occur with calcium-rich minerals, which helps separate it. A clean crystal with a prismatic shape and striations indicates tourmaline even when the color is ambiguous.
Origin & History
Uvite got its first formal write-up in 1929, thanks to Waldemar T. Schaller. The name’s pulled from Sri Lanka’s Uva Province, since that’s where early material tied to the species was reported.
And in the tourmaline world, uvite actually matters because it helped people admit, out loud, how messy the whole group is. Tourmaline isn’t one neat formula you can scribble once and be done with. It’s a chemical parking lot. So uvite sits way over on the calcium end of that spread, and you tend to run into it in rocks where calcium was already in the mix.
Where Is Uvite Found?
Uvite turns up in calcium-rich metamorphic settings, especially skarns and dolomitic marbles. You’ll see it from Sri Lanka and Brazil to classic New York localities and parts of Italy and Russia.
Formation
Look at where uvite shows up and a theme pops out fast: calcium-heavy rocks that got baked and chemically messed with. Skarns are the classic setting. That’s what you get when hot fluids from an intrusion eat into limestone or dolostone and basically rebuild the rock into a new mineral mix. If there’s boron in those fluids, tourmaline can crystallize right in the middle of that chaos.
Uvite is often found alongside calcite, diopside, garnet and sometimes epidote. That association points away from black tourmaline of pegmatite origin. The setting is not always so obvious. Uvite may occur as short, dark prisms scattered through marble, easy to overlook until the sample is tilted and the crystal faces show thin, silvery stripes.
How to Identify Uvite
Color: Most uvite is dark green, greenish brown, or brown to nearly black. Thin edges can show olive or bottle-green when backlit.
Luster: Vitreous luster on fresh crystal faces, sometimes a bit resinous on worn surfaces.
Pick up a crystal and run your fingernail along the length. Those parallel striations feel like tiny washboard ridges on a decent specimen. The real test is a strong light from behind: uvite often gives you a green glow at the edges even when the body looks black. But don’t try to ID it by color alone, because dravite and schorl can look almost identical until you get chemistry or a trusted locality label.
Common Look-Alikes
Uvite is sometimes confused with these materials:
- Dravite (brown tourmaline, often sold as “uvite” when it’s just dark dravite)
- Schorl (black tourmaline, especially when uvite is near-black and heavily striated)
- Chrome diopside (dark green crystals in skarn, but it’s a pyroxene with different crystal habit and cleavage)
- Epidote (pistachio to olive green prismatic crystals that can mimic rough tourmaline from a distance)
- Dyed green quartz or dyed “jade” beads (color sitting in pits and drill holes, used as cheap stand-ins for green tourmaline)
- Green glass imitations (too light for the size, waxy shine, rounded edges where real tourmaline usually feels crisp)
Market Cautions & Treatments
Properties of Uvite
Physical Properties
| Crystal System | Trigonal |
| Hardness (Mohs) | 7-7.5 (Hard (6-7.5)) |
| Density | 3.02-3.26 g/cm3 |
| Luster | Vitreous |
| Diaphaneity | Transparent to translucent |
| Fracture | Uneven |
| Streak | White |
| Magnetism | Non-magnetic |
| Colors | Dark green, Olive green, Greenish brown, Brown, Black |
Chemical Properties
| Classification | Silicates |
| Formula | CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH) |
| Elements | Ca, Mg, Al, Si, B, O, H |
| Common Impurities | Fe, Mn, Ti, Na |
Optical Properties
| Refractive Index | 1.62-1.65 |
| Birefringence | 0.018-0.020 |
| Pleochroism | Moderate |
| Optical Character | Uniaxial |
Uvite Health & Safety
Uvite’s usually fine to pick up and keep on a shelf. Basic rock-handling hygiene is all you need. Wash your hands after you’ve had it in your palm for a bit (especially if it left that faint dusty grit on your fingertips), and don’t go eating a sandwich right after.
Safety Tips
If you’re cutting or grinding it, handle it like any other silicate. Keep the dust out of your lungs by running water on the cut and using decent ventilation. Dust hangs in the air longer than you think, so don’t skip it.
Uvite Value & Price
Price Range
Rough/Tumbled: $10 - $120 per specimen
Cut/Polished: $30 - $300 per carat
Prices rise sharply for well-formed crystals with clean faces and sharp edges, compared with dark, knobby lumps in calcite. Transparent green material suitable for faceting exists, but it makes up only a small fraction of available uvite.
Durability
Durable — Scratch resistance: Good, Toughness: Fair
It handles everyday handling fine, but like most tourmaline it can chip on edges if you bang sharp crystal terminations against harder minerals.
How to Care for Uvite
Use & Storage
Store uvite so that crystal points and edges do not rub against quartz or corundum in the same box. Individual wrapping or a divided flat lined with foam works well.
Cleaning
1) Rinse with lukewarm water to remove grit. 2) Use a soft toothbrush with a drop of mild soap to get into striations and matrix pockets. 3) Rinse again and air-dry; don’t bake it in sun on a windowsill.
Cleanse & Charge
For those who follow the metaphysical side, a quick rinse and a night on a shelf is a common cleansing method. Salt bowls are best avoided, as salt can crust in the striations and leave a residue.
Placement
A small stand helps because tourmaline prisms like to roll, especially on slick shelves. Put it where side light can rake across the striations and you’ll see way more detail.
Caution
Don’t use an ultrasonic cleaner or any harsh acids, especially if your uvite is sitting on calcite (or any other matrix that reacts to acid). And when you’re moving it around, keep an eye on the terminations, since those tips can chip fast if they bump a hard surface.
Works Well With
Uvite in Culture and Practical Use
Uvite has little ancient lore of its own. It was first formally described in 1929 by Waldemar T. Schaller and named for the Uva Province of Sri Lanka, where early material tied to the species was reported. Its main roles are as a collector mineral and as a reference species for calcium-rich tourmaline from carbonate-bearing metamorphic rocks.
In crystal traditions, dark green uvite is linked to steadiness and grounding. Practitioners associate it with the Root Chakra and the Heart Chakra, the element Earth, and the zodiac signs Taurus and Capricorn. Some people keep a piece as a pocket stone, and the striated faces give a tactile surface to hold. These are cultural beliefs, not proven effects, and crystals are not a substitute for medical care for stress, sleep or any health concern.
Common mistakes
- Assuming every dark green tourmaline is uvite
- Using color alone to separate uvite from dravite or schorl
- Ignoring locality information when evaluating a labeled specimen
- Mistaking green-brown garnet or vesuvianite for tourmaline
- Expecting all uvite to be transparent or gem-quality
- Buying a species-level uvite label without asking how the identification was made
Identify Uvite from a photo
Compare Uvite traits, care tips, value clues, and common lookalikes with a clear photo.
