Strontiofluorite is a rare strontium-dominant member of the fluorite group. It is typically identified through chemical analysis, as it closely resembles common fluorite but occurs in specific alkaline environments.

Hardness

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrareFluorite Group family

Strontiofluorite

Hardness: 4
Luster: Vitreous
Streak: White
Transparency: Transparent

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Is this strontiofluorite?

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 strontiofluorite with a known reference. Strontiofluorite sits at Mohs 4, softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Strontiofluorite leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Strontiofluorite 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: cubic. Typical habit: octahedral crystals.

Often confused with

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

Often found alongside strontiofluorite

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

All properties

Chemical formula: (Sr,Ca)F₂
Mohs hardness: 4
Density: 3.37 g/cm³
Colors: Colorless White Pale Yellow
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Cubic
Crystal habit: Octahedral Crystals
Cleavage: Perfect Octahedral
Rarity: Rare
Uses: Collector
Host rock: Alkaline Igneous Rocks
Typical price: $50-300 per specimen

Where rockhounds find strontiofluorite

Classic worldwide localities

Kola Peninsula, Russia

Field-hunting tip

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

Common questions

How do you identify strontiofluorite?+

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

Where is strontiofluorite found?+

Notable localities include Kola Peninsula, Russia.

How much is strontiofluorite 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 strontiofluorite?+

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

What minerals are found with strontiofluorite?+

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

What kind of rock does strontiofluorite form in?+

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

What is strontiofluorite used for?+

Strontiofluorite is used in collector.

Find strontiofluorite on the map

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