Nacaphite is a rare phosphate mineral primarily found in hyper-alkaline igneous complexes. It usually occurs as colorless or pale yellow grains and tabular crystals embedded within nepheline-rich environments.

Hardness

3.5

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrare

Nacaphite

Hardness: 3.5
Luster: Vitreous
Streak: White
Transparency: Transparent

Is this nacaphite?

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 nacaphite with a known reference. Nacaphite sits at Mohs 3.5, softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Nacaphite leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Nacaphite typically shows a vitreous luster.
4
Match the color range
Compare against the expected color range: colorless, white, pale yellow.
5
Look at form & habit
Crystal system: trigonal. Typical habit: tabular crystals, massive, granular.

Often confused with

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

mineral

Apatite

Mohs 5

How to tell apart: Apatite is the harder of the two (Mohs 5 vs. 3.5).

How to tell apart: Nacaphite is noticeably harder (Mohs 3.5 vs. 2-2.5).

Compare →

Often found alongside nacaphite

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

All properties

Chemical formula: Na₂CaPO₄F
Mohs hardness: 3.5
Density: 2.81 g/cm³
Colors: Colorless White Pale Yellow
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Trigonal
Crystal habit: Tabular Crystals, Massive, Granular
Cleavage: Good On {0001}
Rarity: Rare
Uses: Collector
Host rock: Alkaline Igneous Rocks
Typical price: $50-300 per specimen

Where rockhounds find nacaphite

Classic worldwide localities

Khibiny Massif, Russia
Lovozero Massif, Russia

Field-hunting tip

Look in alkaline igneous rocks country, the host setting where nacaphite typically forms. If you start seeing villiaumite, apatite, nepheline in float, you are in the right ground. Field specimens usually show a tabular crystals, massive, granular habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify nacaphite?+

Mohs hardness is 3.5. It typically shows a vitreous luster. The streak is white. Common colors include colorless, white, pale yellow.

Where is nacaphite found?+

Notable localities include Khibiny Massif, Russia; Lovozero Massif, Russia.

How much is nacaphite worth?+

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

What rocks look like nacaphite?+

Nacaphite is most often confused with Apatite, Villiaumite. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with nacaphite?+

Nacaphite commonly co-occurs with Villiaumite, Apatite, Nepheline, Microcline. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does nacaphite form in?+

Nacaphite typically forms in alkaline igneous rocks. Working float back to the host body is the standard way to chase a fresh occurrence.

What is nacaphite used for?+

Nacaphite is used in collector.

Find nacaphite on the map

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