Kämmererite Mineral Overview

• Mineral name: Kämmererite
• Mineral class: Silicate (phyllosilicate, chlorite group)
• Chemical formula: (Mg,Cr,Al)₆(Si,Al)₄O₁₀(OH)₈
• Crystal system: Monoclinic
• Mohs hardness: 2–2.5
• Color range: Purple, reddish-purple, violet, pink
• Luster: Pearly to vitreous
• Streak: Pale pink to white
• Cleavage: Perfect (basal)
• Fracture: Uneven
• Specific gravity: Approximately 2.6–2.8
• Transparency: Translucent to opaque
• Common locations: Turkey, Russia, United States, South Africa
• Uses: Collector mineral, ornamental stone
• Similar minerals: Clinochlore, lepidolite, chromian chlorite

Naming and Classification

Kämmererite is a chromium-rich variety of clinochlore, belonging to the chlorite group of phyllosilicates.

It is named after August Alexander Kämmerer, a Russian mining official.

Its distinctive coloration comes from:

• Chromium (Cr) replacing aluminum in the structure

Physical and Optical Characteristics

Kämmererite typically occurs as:

• Micaceous, flaky masses
• Scaly or platy aggregates
• Rare small crystals

Its most striking feature is its unusual purple to violet color, which may appear:

• Pinkish-purple
• Deep violet
• Reddish-lilac

The luster is pearly on cleavage surfaces and vitreous on crystal faces.

With a Mohs hardness of 2–2.5, it is very soft.

Cleavage (Key Feature)

Like other chlorite minerals, kämmererite exhibits:

• Perfect basal cleavage

This allows it to split into:

• Thin, flexible sheets

Color Origin (Key Feature)

The vivid purple coloration is due to:

• Chromium (Cr³⁺) in the crystal structure

This makes kämmererite one of the few naturally occurring purple chlorite minerals, giving it strong visual appeal.

Chemical Composition and Structure

Kämmererite is composed of:

• Magnesium (Mg)
• Chromium (Cr)
• Aluminum (Al)
• Silicon (Si)
• Hydroxyl (OH)

It has a sheet silicate (phyllosilicate) structure, consisting of:

• Stacked layers of silicate sheets
• Weak bonding between layers

This structure explains its:

• Softness
• Flaky texture
• Perfect cleavage

Formation and Geological Occurrence

Kämmererite forms in metamorphic environments, particularly:

Ultramafic Rocks

• Serpentinites
• Chromite-bearing rocks

Metamorphic Alteration Zones

• Where chromium-rich minerals are present

Typical formation conditions include:

• Low to moderate درجات الحرارة
• Presence of chromium and magnesium

It is commonly associated with:

• Chromite
• Serpentine
• Talc

Common Locations

Kämmererite is found in several notable regions:

• Turkey: Bursa Province (famous for high-quality specimens)
• Russia: Ural Mountains
• United States: California
• South Africa: Chromium-rich deposits

Turkish material is especially well known for its vibrant purple color.

Uses and Practical Significance

Kämmererite has limited practical use:

Collector Mineral

• Highly valued for its rare purple color
• Attractive micaceous appearance

Ornamental Stone

• Occasionally used in carvings or decorative objects

It has no industrial applications.

Similar and Related Minerals

Kämmererite can resemble:

• Lepidolite: Also purple but lithium-rich and more translucent
• Clinochlore: Typically green rather than purple
• Serpentine: More massive and usually green

Color and association with chromium-rich rocks help distinguish it.

Identification Notes for Collectors

• Look for purple, flaky or micaceous material
• Note very soft hardness (2–2.5)
• Observe perfect sheet-like cleavage
• Check pearly luster on surfaces
• Consider association with chromite and serpentinite

Kämmererite is a chromium-rich chlorite mineral, recognized for its rare purple coloration and flaky texture, making it a visually distinctive and desirable specimen for mineral collectors.