Kittatinnyite
Chemical formula: Ca₂Mn²⁺Mn³⁺₂(SiO₄)₂(OH)₄·9H₂O
Kittatinnyite is a very rare manganese and calcium silicate, forming microscopic, hexagonal, reddish-brown crystals.
Properties
- Mohs hardness
- 4
- Color
- Bright yellow
- Luster
- Vitreous
- Streak
- Light yellow
- Density
- 2.61
- Cleavage
- {0001}
- Fracture
- Uneven
- Transparency
- Translucent,Opaque
- Crystal system
- Hexagonal
Diagnostic features
## Identification Identification of kittatinnyite is possible almost exclusively through advanced analytical methods, such as X-ray diffraction (XRD) and chemical microanalysis (EDS/WDS). Under collecting conditions, identification relies on the characteristic form of microscopic, hexagonal, platy, reddish-brown crystals found in association with other Franklin minerals. ## Distinguishing from Similar Minerals It can be confused with other fine-grained manganese minerals, such as hausmannite or some garnets. Differentiation requires specialized studies, as visual features at this scale are insufficient for certain identification. ## Crystal Forms Kittatinnyite forms very small, thin, platy crystals with a hexagonal outline. These crystals often group into small, rosette aggregates.
Geological environment
## Genesis Kittatinnyite is a secondary mineral, formed by hydrothermal processes within metamorphosed zinc and manganese ore deposits. It occurs in small fractures and rock cavities. ## Mineral Associations This mineral coexists with other rare minerals from the Franklin deposit, such as franklinite, willemite, zincite, andradite, rhodochrosite, barite, and especially with charlesite, to which it is structurally closely related. ## Localities The only confirmed occurrence of kittatinnyite in the world is its type locality – the Franklin Mine in Sussex County, New Jersey, USA. This is one of the most famous mineralogical sites in the world, renowned for its unique paragenesis of zinc, manganese, and iron minerals.
Rarity
Very rare
For collectors
## Quality Criteria As a microscopic mineral ("micromount"), the collector's value of kittatinnyite depends on several factors. The most desirable specimens are those with well-formed, sharp crystals forming aesthetic, rosette aggregates. Crystal size is also important – the larger they are (even if fractions of a millimeter), the more valuable the specimen. A contrasting rock matrix and the presence of rare associated minerals also enhance the specimen's appeal. ## Popular Localities The only source of kittatinnyite specimens is the Franklin Mine in New Jersey, USA. All samples available on the collector's market originate from this single location.
Care and storage
## Cleaning Kittatinnyite specimens, due to their microscopic size and fragility, should not be cleaned mechanically or chemically. Any attempts at cleaning may destroy or dislodge the tiny crystals from the host rock. It is safest to leave the specimen undisturbed. ## What to Avoid Avoid contact with all chemicals, including acids and detergents. The mineral is likely sensitive to high temperatures, which can cause dehydration and structural damage. It should be protected from vibrations and impacts. ## Storage Microscopic specimens, such as kittatinnyite, are best stored in specialized "micromount" boxes, which protect them from dust, moisture, and mechanical damage. Display should be away from heat sources and direct sunlight.