Kozoite-(Nd) is an extremely rare rare-earth carbonate mineral typically found as tiny, needle-like acicular crystals or radiating sprays. It is most often discovered in cavities within alkaline pegmatites, where it is frequently associated with minerals like calcite and albite.

Hardness

4-4.5

Mohs

Luster

Vitreous

Streak

White

Transparency

Translucent

mineralrareAncylite Group family

Kozoite-(Nd)

Hardness: 4-4.5
Luster: Vitreous
Streak: White
Transparency: Translucent

No image

Is this kozoite-(nd)?

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 kozoite-(nd) with a known reference. Kozoite-(Nd) sits at Mohs 4-4.5 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Kozoite-(Nd) leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Kozoite-(Nd) typically shows a vitreous luster.
4
Match the color range
Compare against the expected color range: white, colorless, pale pink.
5
Look at form & habit
Crystal system: orthorhombic. Typical habit: acicular crystals, radiating aggregates.

Often confused with

Kozoite-(Nd) vs. its common look-alikes — and how to tell them apart in the field.

Often found alongside kozoite-(nd)

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

All properties

Chemical formula: Nd(CO₃)(OH,F)
Mohs hardness: 4-4.5
Density: 4.21 g/cm³
Colors: White Colorless Pale Pink
Streak: White
Luster: Vitreous
Transparency: Translucent
Crystal system: Orthorhombic
Crystal habit: Acicular Crystals, Radiating Aggregates
Cleavage: None Observed
Rarity: Rare
Uses: Collector, Research
Host rock: Alkaline Igneous Rocks, Specifically Pegmatites
Typical price: $50-300 per small specimen

Where rockhounds find kozoite-(nd)

Classic worldwide localities

Hizen-cho, Saga Prefecture, Japan
Kola Peninsula, Russia

Field-hunting tip

Look in alkaline igneous rocks, specifically pegmatites country — that is the host setting where kozoite-(nd) typically forms. If you start seeing calcite, albite, aegirine in float, you are in the right ground. Field specimens usually show a acicular crystals, radiating aggregates habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify kozoite-(nd)?+

Mohs hardness is 4-4.5. It typically shows a vitreous luster. The streak is white. Common colors include white, colorless, pale pink.

Where is kozoite-(nd) found?+

Notable localities include Hizen-cho, Saga Prefecture, Japan; Kola Peninsula, Russia.

How much is kozoite-(nd) worth?+

Typical asking prices fall in the range of $50-300 per small specimen. Quality, size, and provenance can move individual specimens well outside that range.

What rocks look like kozoite-(nd)?+

Kozoite-(Nd) is most often confused with Ancylite-(Ce), Strontianite, Aragonite. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with kozoite-(nd)?+

Kozoite-(Nd) commonly co-occurs with Calcite, Albite, Aegirine, Microcline. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does kozoite-(nd) form in?+

Kozoite-(Nd) typically forms in alkaline igneous rocks, specifically pegmatites. Working float back to the host body is the standard way to chase a fresh occurrence.

What is kozoite-(nd) used for?+

Kozoite-(Nd) is used in collector, research.

Find kozoite-(nd) on the map

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