Rossmanite is a rare member of the tourmaline group, chemically distinguished by a lithium-rich composition and vacancies in the X-site of its crystal structure. It typically occurs as small, pale pink or colorless prismatic crystals within highly evolved lithium pegmatites. Collectors prize it as a rare species, though it is visually indistinguishable from other light-colored tourmalines without advanced analytical testing.

Hardness

7-7.5

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrareTourmaline Group family

Rossmanite

Hardness: 7-7.5
Luster: Vitreous
Streak: White
Transparency: Transparent

Is this rossmanite?

5-step field check

Run through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.

1
Test the hardness
Try to scratch rossmanite with a known reference. Rossmanite sits at Mohs 7-7.5 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Rossmanite leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Rossmanite typically shows a vitreous luster.
4
Match the color range
Compare against the expected color range: pink, colorless, pale red.
5
Look at form & habit
Crystal system: trigonal. Typical habit: prismatic crystals.

Often confused with

Rossmanite vs. its common look-alikes — and how to tell them apart in the field.

Often found alongside rossmanite

Minerals reported to co-occur with rossmanite. Spotting these in float or country rock is a strong cue you are in the right ground.

All properties

Chemical formula: ☐(LiAl₂)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Mohs hardness: 7-7.5
Density: 3.06 g/cm³
Colors: Pink Colorless Pale Red
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Trigonal
Crystal habit: Prismatic Crystals
Cleavage: Indistinct
Rarity: Rare
Uses: Collector
Host rock: Lithium-rich Pegmatites
Typical price: $50-500 thumbnail

Where rockhounds find rossmanite

Classic worldwide localities

Rožná, Czech Republic
Corinth, Massachusetts, USA
San Diego County, California, USA

Field-hunting tip

Look in lithium-rich pegmatites country — that is the host setting where rossmanite typically forms. If you start seeing quartz, lepidolite, albite in float, you are in the right ground. Field specimens usually show a prismatic crystals habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify rossmanite?+

Mohs hardness is 7-7.5. It typically shows a vitreous luster. The streak is white. Common colors include pink, colorless, pale red.

Where is rossmanite found?+

Notable localities include Rožná, Czech Republic; Corinth, Massachusetts, USA; San Diego County, California, USA.

How much is rossmanite worth?+

Typical asking prices fall in the range of $50-500 thumbnail. Quality, size, and provenance can move individual specimens well outside that range.

What rocks look like rossmanite?+

Rossmanite is most often confused with Elbaite, Liddicoatite, Foitite. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with rossmanite?+

Rossmanite commonly co-occurs with Quartz, Lepidolite, Albite, Spodumene. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does rossmanite form in?+

Rossmanite typically forms in lithium-rich pegmatites. Working float back to the host body is the standard way to chase a fresh occurrence.

What is rossmanite used for?+

Rossmanite is used in collector.

Find rossmanite on the map

RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.