Viitaniemiite is a very rare phosphate mineral found primarily in complex granite pegmatites. It is typically discovered as massive aggregates and is distinguished from similar-looking phosphate minerals like amblygonite through specific chemical analysis.

Hardness

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent, translucent if clouded by inclusions

mineralrare

Viitaniemiite

Hardness: 5
Luster: Vitreous
Streak: White
Transparency: Transparent, translucent if clouded by inclusions

Is this viitaniemiite?

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 viitaniemiite with a known reference. Viitaniemiite sits at Mohs 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: colorless, gray, gray white, white.
5
Look at form & habit
Crystal system: monoclinic. Typical habit: massive.

Often confused with

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

Often found alongside viitaniemiite

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

All properties

Chemical formula: NaCaAlPO₄F₃
Mohs hardness: 5
Density: 3.245 g/cm³
Colors: Colorless Gray Gray white White
Streak: White
Luster: Vitreous
Transparency: Transparent, translucent if clouded by inclusions
Crystal system: Monoclinic
Crystal habit: Massive
Cleavage: Good on {101}
Rarity: Rare
Uses: Collector
Host rock: An inclusion in eosphorite and rimming morinite, from a complex zoned granite pegmatite (Viitaniemi pegmatite, Finland); in druses in granite (Greifensteine, Germany)

Where rockhounds find viitaniemiite

Classic worldwide localities

Viitaniemi pegmatite, near Eräjärvi, Finland
Greifensteine, near Ehrenfriedersdorf, Saxony, Germany
Francon quarry, Montreal Island, Montreal, Quebec, Canada
Dassu, Braldu Valley, Pakistan

Field-hunting tip

Where it forms: An inclusion in eosphorite and rimming morinite, from a complex zoned granite pegmatite (Viitaniemi pegmatite, Finland); in druses in granite (Greifensteine, Germany). If you start seeing eosphorite, fluorapatite, crandallite in float, you are in the right ground. Typical habit: massive. Train your eye for that shape before scanning the outcrop.

Common questions

How do you identify viitaniemiite?+

Mohs hardness is 5. Luster: vitreous. The streak is white. Common colors include colorless, gray, gray white, white.

Where is viitaniemiite found?+

Notable localities include Viitaniemi pegmatite, near Eräjärvi, Finland; Greifensteine, near Ehrenfriedersdorf, Saxony, Germany; Francon quarry, Montreal Island, Montreal, Quebec, Canada; Dassu, Braldu Valley, Pakistan.

What rocks look like viitaniemiite?+

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

What minerals are found with viitaniemiite?+

Viitaniemiite commonly co-occurs with Eosphorite, Fluorapatite, Crandallite, Montebrasite, Morinite, Lacroixite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does viitaniemiite form in?+

Where it forms: An inclusion in eosphorite and rimming morinite, from a complex zoned granite pegmatite (Viitaniemi pegmatite, Finland); in druses in granite (Greifensteine, Germany). Working float back to the host body is the standard way to chase a fresh occurrence.

What is viitaniemiite used for?+

Viitaniemiite is used in collector.

Find viitaniemiite on the map

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