Henrysunite
Chemical formula: Na₂(C₂H₃O₃)¹⁻₂(H₂O)
Henrysunite is an organic sodium mineral, occurring as microscopic, colorless crystals, found only in Arizona, USA.
Properties
- Mohs hardness
- 1.5-2
- Color
- colorless
- Luster
- Vitreous
- Streak
- white
- Density
- 1.82
- Cleavage
- None
- Fracture
- Uneven
- Transparency
- Transparent
- Crystal system
- Orthorhombic
Diagnostic features
## Identification Identification of henrysunite is only possible using advanced analytical methods, such as X-ray diffraction (XRD) and spectroscopy. In field conditions or in a typical collection, it is impossible to identify based on visual characteristics. Its occurrence as tiny, colorless needles on host rock in a known locality is the only clue. ## Distinguishing from similar minerals It can be confused with many other secondary minerals that form colorless, acicular crystals, such as gypsum or other sulfates and carbonates. Certain differentiation requires specialized laboratory equipment. ## Crystal forms Henrysunite forms elongated, prismatic to acicular crystals, often grouped into radial or chaotic aggregates.
Geological environment
## Genesis Henrysunite is a secondary mineral that formed as a result of reactions between sodium-rich solutions and organic matter (likely from decaying vegetation) in a dry, desert climate. Its only known occurrence is in mine dumps, where it formed in voids within volcanic rock (basalt). ## Mineral associations At its type locality, it co-occurs with minerals such as hoganite, paceite, calcite, aragonite, gypsum, and minerals from the zeolite group. ## Localities The only confirmed locality for henrysunite in the world is the Pinal Copper Mine, in the Pioneer District, Pinal County, Arizona, USA.
Rarity
Extremely rare
For collectors
## Quality criteria As a "micromount" mineral, the only criterion for evaluation is the presence of well-formed, identifiable crystals on the rock matrix. The size of the aggregates and the abundance of occurrence on a given rock fragment increase the specimen's value. Due to its microscopic nature, purity and color are not applicable. ## Popular localities The only source of specimens is historical collections from the Pinal mine in Arizona. The mineral is not commercially extracted, and specimens on the market come exclusively from the redistribution of old specialized collections.
Care and storage
## Cleaning Due to its extreme rarity, small size, and fragility, specimens containing henrysunite should not be cleaned mechanically or chemically. Any attempts at cleaning risk irreversible destruction of the crystals. They should be treated solely as objects for microscopic observation. ## What to avoid Avoid contact with water, chemicals, as well as any vibrations and impacts. Changes in temperature and humidity can be harmful. Specimens must not be touched. ## Storage Specimens should be stored in stable conditions, in a closed, padded "micromount" box, protecting them from dust, light, and humidity changes. Display is only possible in specialized showcases with controlled environments.