Natrotitanite is a rare member of the titanite group, distinguished by the substitution of sodium for calcium within the crystal lattice. It typically occurs in alkaline igneous environments and is most easily identified by its wedge-shaped habit similar to standard titanite but found in specific geological settings like the Kola Peninsula.

Hardness

5-5.5

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent to translucent

mineralrareTitanite Group family

Natrotitanite

Hardness: 5-5.5
Luster: Vitreous
Streak: White
Transparency: Transparent to translucent

No image

Is this natrotitanite?

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 natrotitanite with a known reference. Natrotitanite sits at Mohs 5-5.5, softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Streak: white.
3
Read the luster
Hold the specimen under a strong light. Luster: vitreous.
4
Match the color range
Compare against the expected color range: milky white, yellowish gray.
5
Look at form & habit
Crystal system: monoclinic. Typical habit: wedge-shaped crystals, massive.

Often confused with

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

mineral

Titanite

Mohs 5-5.5

How to tell apart: Luster reads vitreous on Natrotitanite and adamantine to resinous on Titanite.

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Often found alongside natrotitanite

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

All properties

Chemical formula: (Na₀.₅Y₀.₅)Ti(SiO₄)O
Mohs hardness: 5-5.5
Density: 3.833 g/cm³
Colors: Milky white Yellowish gray
Streak: White
Luster: Vitreous
Transparency: Transparent to translucent
Crystal system: Monoclinic
Crystal habit: Wedge-shaped crystals, massive
Cleavage: None
Rarity: Rare
Uses: Collector
Host rock: In the wall rock zone of an alkaline granite associated with a granitic massif

Where rockhounds find natrotitanite

Classic worldwide localities

Verkhnee Espe REE deposit, northern margin of the Akjailyautuas granite massif, Kazakhstan

Field-hunting tip

Where it forms: In the wall rock zone of an alkaline granite associated with a granitic massif. If you start seeing yttrium-bearing fluorite, microcline, albite in float, you are in the right ground. Typical habit: wedge-shaped crystals, massive. Train your eye for that shape before scanning the outcrop.

Common questions

How do you identify natrotitanite?+

Mohs hardness is 5-5.5. Luster: vitreous. The streak is white. Common colors include milky white, yellowish gray.

Where is natrotitanite found?+

Notable localities include Verkhnee Espe REE deposit, northern margin of the Akjailyautuas granite massif, Kazakhstan.

What rocks look like natrotitanite?+

Natrotitanite is most often confused with Titanite. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with natrotitanite?+

Natrotitanite commonly co-occurs with Yttrium-bearing fluorite, Microcline, Albite, Quartz, Riebeckite, Aegirine. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does natrotitanite form in?+

Where it forms: In the wall rock zone of an alkaline granite associated with a granitic massif. Working float back to the host body is the standard way to chase a fresh occurrence.

What is natrotitanite used for?+

Natrotitanite is used in collector.

Find natrotitanite on the map

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