Clinometaborite

Chemical formula: HBO₂

Clinometaborite is a rare borate mineral, a polymorph of metaboric acid, occurring as tiny, colorless crystals.

## Characteristics Clinometaborite is a mineral from the borate group, chemically corresponding to metaboric acid (HBO₂). It occurs extremely rarely, forming very small, bladed or acicular crystals, usually not exceeding 1 mm in length. They are colorless and transparent, with a vitreous luster. Due to its small size and rarity, it is a mineral known mainly in scientific and specialized circles. ## Physical Properties Clinometaborite crystals are characterized by a vitreous luster and are transparent. Hardness and density have not been precisely measured due to the small size of the samples. The mineral does not exhibit fluorescence under ultraviolet light. ## History and Name The name "clinometaborite" refers to its monoclinic crystal symmetry and chemical composition – it is a polymorph of metaboric acid. It was described as a new mineral in 1995 by C.L. Christ and J.R. Clark based on material from a drill core in the Kramer Valley, California, USA.

Properties

Color
Colorless
Luster
Vitreous
Streak
White
Density
2.049
Cleavage
Perfect on {100}
Transparency
Translucent
Crystal system
Monoclinic

Diagnostic features

## Identification Identification of clinometaborite is possible only through advanced analytical methods, such as X-ray diffraction (XRD) and chemical analysis. Visual identification in the field or even in a collection is impossible due to its microscopic size and lack of characteristic macroscopic features. ## Distinguishing from similar minerals It can be confused with other colorless, acicular secondary minerals occurring in association, such as gypsum or other borates. Certain distinction requires specialized laboratory equipment. ## Crystal forms It forms very small, bladed crystals elongated along one axis, reaching up to 1 mm in length. They occur as single needles or in small, tangled aggregates.

Geological environment

## Genesis Clinometaborite is a secondary mineral, forming under specific conditions within borate deposits. It is likely formed by the dehydration of other borate minerals under low humidity conditions. ## Mineral associations At the type locality (Kramer Borate Deposit), it co-occurs with metaborite (its trigonal polymorph), sassolite, tincalconite, and kernite. ## Localities The only confirmed occurrence of this mineral in the world is the Kramer Borate Deposit (U.S. Borax Baker drill core) in Kern County, California, USA.

Rarity

Extremely rare

For collectors

## Quality criteria As a micromineral of purely scientific significance, the only criterion for value is the confirmed authenticity of the specimen from the only known locality. Any, even the smallest, crystal identified as clinometaborite is an extremely valuable acquisition for specialized systematic collections and research institutions.

Care and storage

## Cleaning Due to its extreme rarity and fragility, clinometaborite specimens should not be cleaned by any mechanical or chemical means. Any attempts at cleaning may irreversibly damage the sample. ## What to avoid Avoid contact with water and chemicals, vibrations, temperature changes, and any touching. The mineral is likely sensitive to moisture. ## Storage Specimens should be stored exclusively in specialized, sealed micromount containers, under stable temperature and humidity conditions, away from light and vibrations.

External references

Sources

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