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Trolleite: A Rare Phosphate, and the Blue Rock Sold Under Its Name

By Digital Towns Crystals ยท Last reviewed October 8, 2026

Short answer: trolleite is a real but uncommon mineral, an aluminum phosphate with the formula Al4(PO4)3(OH)3, first described from Sweden in 1868. The "trolleite" carved into towers, spheres and hearts is a rock: white to gray quartz mottled with blue phosphates, which sellers list as trolleite, lazulite and scorzalite. It is about 5.5 to 6 on the Mohs scale in the blue areas and 7 in the quartz, and it is denser than plain quartz. Judge carvings by the depth and spread of the blue.

Why does "trolleite" mean two different things?

Because mineralogists and the decorative stone trade use the word differently.

To a mineralogist, trolleite is one species with one formula and one crystal structure. It is pale, usually massive, rarely seen as clean crystals, and mostly of interest to systematic collectors. To the crystal trade, trolleite is the name on a carving made from a mixed blue-and-white rock. The listings in our own Market describe the material as quartz, scorzalite and lazulite, and that is the honest way to think of it: a quartz-rich rock colored by blue aluminum phosphates, one of which may be trolleite itself.

The difference matters when you read claims. Properties quoted for "trolleite" in shop copy often mix the numbers for the mineral, the blue phosphates and the quartz. A carving is not a trolleite crystal any more than a granite countertop is a feldspar crystal. It is still a genuine, natural material, and a good piece is striking; it just needs to be judged as a rock.

What is the mineral trolleite?

Webmineral's trolleite data gives the essentials:

Property Trolleite
Formula Al4(PO4)3(OH)3
Crystal system Monoclinic
Color Light blue, light green
Mohs hardness 5.5 to 6
Specific gravity 3.09
Streak White
Environment Amphibolite-grade metamorphic rocks
Type locality Vastana mine, near Nasum, Skane, Sweden (1868)

It is named for Hans Gabriel Trolle-Wachtmeister (1782 to 1871), a Swedish chemist. Its crystal structure was worked out by Moore and Araki in 1974, who described it in American Mineralogist as a very dense structure built from face-sharing octahedral pairs. That density shows: at 3.09, trolleite is noticeably heavier than quartz.

Trolleite rarely occurs alone. Webmineral's photo records pair it with darker blue lazulite at the Champion Mine in the White Mountains of Mono County, California, and with pink berlinite in Sweden. Those associations are the clue to the trade material: trolleite forms in aluminum-rich rocks where phosphorus is available, the same setting that produces lazulite.

What are lazulite and scorzalite?

They are the deeper blue partners, and in most carvings they supply most of the color.

Lazulite

Lazulite is a magnesium aluminum phosphate, MgAl2(PO4)2(OH)2, described in 1795 from Werfen near Salzburg, Austria, according to Webmineral's lazulite page. Its color ranges from sky blue to blackish blue, its hardness is 5 to 6, and it is non-fluorescent. Minerals.net lists its specific gravity at 3.0 to 3.1 and notes that lazulite embedded in white quartz, especially from Austria, is sometimes sliced into slabs or polished for collectors. That is essentially what decorative "trolleite" is: blue phosphate in a quartz host.

Famous crystal localities include Graves Mountain in Georgia and Rapid Creek in the Yukon. The International Gem Society adds that the Champion Mine in Mono County produces lazulite masses up to six inches across, and that clean faceted lazulite over five carats is extremely rare.

Scorzalite

Scorzalite is the iron-rich end of the same series, (Fe,Mg)Al2(PO4)2(OH)2. Webmineral's scorzalite entry gives its type locality as the Corrego Frio pegmatite in Minas Gerais, Brazil, and its naming for the Brazilian mineralogist Evaristo Pena Scorza. It forms in highly aluminous metamorphic rocks and granitic pegmatites. The IGS sets out how the series shifts with iron: specific gravity rises from 3.08 in magnesium-rich lazulite to 3.38 in iron-rich scorzalite. Telling the two apart by eye is close to impossible. In a carving, darker, inkier blue patches lean toward the iron end, but only an analysis can say.

How do you recognize trolleite rock?

Look for three textures together:

  1. Blue phosphate. Patches, veins and clouds from pale sky blue to deep navy. Lazulite-series minerals are strongly pleochroic, so a translucent edge can look a slightly different blue from different angles.
  2. Quartz. White to gray, glassy, with conchoidal fracture. Quartz is the hardest part of the rock, at Mohs 7 with a specific gravity of 2.6 to 2.7 according to Geology.com's quartz page.
  3. Other flecks. Some pieces show small silvery or rusty spots; treat them as part of the rock rather than as a flaw unless they break the polish.

The weight test is useful. Every phosphate in the rock is denser than quartz, so a trolleite sphere with plenty of blue feels heavier than a clear or milky quartz sphere of the same diameter. A very light piece with bright, even color deserves a closer look.

Trolleite versus lapis lazuli and sodalite

The names cause confusion. Lazulite and lazurite sound alike but are unrelated. Lazurite is the blue silicate that makes lapis lazuli and comes with white calcite and gold pyrite. Minerals.net's lazurite page notes that lazurite has a blue streak, while lazulite has a white streak and a higher specific gravity. Practical differences:

  • Lapis lazuli: saturated royal blue, flecks of brassy pyrite, white calcite rather than glassy quartz.
  • Sodalite: royal blue with white veins, lighter in the hand, and often fluorescent. Lazulite is not.
  • Trolleite rock: paler to mid blue in irregular patches, glassy quartz between them, no pyrite, no fluorescence.

The planned lapis vs sodalite comparison covers the other two in depth. Blue kyanite, another aluminum-rich metamorphic mineral, is bladed and fibrous rather than mottled.

Is trolleite treated or faked?

There is no established treatment for this rock, and it is not a common target for imitation, partly because it is relatively inexpensive. The risks are more ordinary:

  • Dyed quartzite. Dyed rock shows color concentrated along cracks and grain boundaries. Natural blue phosphate sits in discrete patches, some of them with sharp edges.
  • Resin fills. Quartz and phosphate polish to different heights, and carvers sometimes fill pits. Tilt the piece under one light and look for glassy islands that do not match either mineral.
  • Name inflation. Calling the rock "rare trolleite" stretches it. The mineral is uncommon; the carving material is a phosphate-bearing quartz rock that is produced in volume for towers and spheres.

How do you care for a trolleite carving?

The blue phosphates sit at 5.5 to 6, softer than the quartz around them, so the blue areas are the ones that scuff. The IGS advises storing lazulite away from harder stones such as quartz and topaz and cleaning it only with a soft brush, mild detergent and warm water. That advice carries over to carvings. Keep towers off hard shelves where the point can chip, and do not tumble or soak them. Lazulite is brittle, so a dropped sphere is more likely to crack than a quartz one.

What does crystal tradition say?

In crystal traditions, trolleite is associated with the upper chakras and with intuition and inner wisdom, themes it shares with many blue stones. These are cultural beliefs, not measurable properties, and they say nothing about which specimen is better made.

Choosing a trolleite tower or sphere

Price follows size first, then color. Good pieces have deep, well-distributed blue across most of the surface, a clean polish with no deep pits, and, for towers, a crisp point and straight faces. Pale, mostly white material belongs at the bottom of the range. Because the rock is opaque, what you see on the surface is close to what you get; ask for photos from all sides.

From the Market:

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Trolleite in stock

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Frequently asked questions

Is trolleite a real mineral?

Yes. Trolleite is a recognized aluminum phosphate, Al4(PO4)3(OH)3, described in 1868 from the Vastana mine in Sweden. Decorative "trolleite" carvings, however, are a rock of quartz with blue phosphates such as lazulite and scorzalite, not single crystals of the mineral.

Is trolleite the same as lapis lazuli?

No. Lapis lazuli is a rock colored by lazurite, a silicate, and typically contains pyrite and calcite. Trolleite rock is colored by aluminum phosphates such as lazulite, set in quartz. The names lazulite and lazurite are similar, but the minerals are unrelated.

How hard is trolleite?

The blue phosphate areas are 5.5 to 6 on the Mohs scale, while the quartz around them is 7. That means the blue zones scratch more easily than the white ones, so store carvings apart from quartz points and other hard stones.

Where does trolleite come from?

The mineral's type locality is in Skane, Sweden, and it also occurs with lazulite at the Champion Mine in California. The related iron phosphate scorzalite was first described from a pegmatite in Minas Gerais, Brazil, a region known for blue phosphate minerals.

Why is my trolleite sphere so heavy?

The blue minerals are dense. Trolleite has a specific gravity of 3.09 and lazulite about 3.0 to 3.1, compared with 2.6 to 2.7 for quartz. The more blue phosphate a sphere carries, the heavier it feels for its size.

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