Paratimroseite
Chemical formula: Pb<sup>2+</sup>Cu<sup>2+</sup><sub>2</sub>(Te<sup>6+</sup>O<sub>6</sub>)·H<sub>2</sub>O
Paratimroseite is a very rare lead copper tellurate, forming microscopic, platy crystals of an intense green color.
Properties
- Luster
- Vitreous
- Streak
- Light green
- Cleavage
- Perfect on {100}
- Transparency
- Transparent
- Crystal system
- Monoclinic
Diagnostic features
## Identification Paratimroseite is primarily identified by its characteristic emerald-green color, its occurrence as small, platy crystals forming rosetted aggregates, and its specific geological environment. Due to its microscopic size, definitive identification requires advanced analytical methods such as Raman spectroscopy or X-ray diffraction (XRD). ## Distinguishing from Similar Minerals Paratimroseite can be confused with other green secondary copper minerals, such as brochantite, malachite, or bayldonite. Distinguishing it from timroseite, to which it is closely related, is impossible without specialized crystallographic studies. It stands out from many of these due to its vitreous luster and specific crystal habit. ## Crystal Forms The mineral forms very small, thin, platy or bladed crystals, often flattened. These crystals combine into characteristic radial or rosetted aggregates. It also occurs as thin coatings and earthy masses.
Geological environment
## Genesis Paratimroseite is a secondary mineral, formed in the oxidation zones (gossans) of ore deposits rich in tellurium. It forms as a result of the weathering of primary tellurides and sulfides under low temperature and pressure conditions, in the presence of oxygen-rich waters. ## Mineral Associations At its type locality (Baker mine, California), paratimroseite co-occurs with many other rare secondary minerals, such as timroseite, cerussite, chlorargyrite, bromargyrite, chrysocolla, hematite, jarosite, munakataite, ottoite, parakhinite, phosphohedyphane, pyromorphite, plumbogummite, quetzalcoatlite, and wulfenite. It often grows on quartz. ## Localities The only confirmed and described locality for paratimroseite worldwide is its discovery site – the Baker mine, Silver Lake District, San Bernardino County, California, USA.
Rarity
Very rare
For collectors
## Quality Criteria As a microscopic mineral ("micromount"), the collectible value of paratimroseite depends on several factors. Specimens with well-formed, sharp crystals forming aesthetic, rosetted aggregates are most highly prized. The intensity and purity of the emerald-green color also play a key role. The contrast with the host rock matrix (most often quartz) and the richness of associations with other rare minerals are important. Specimens where crystals are clearly visible and undamaged achieve the highest value. ## Popular Localities All known collectible specimens come from a single location worldwide: the Baker mine in California, USA. This is the type locality and the only one, which makes every specimen from this locality unique.
Care and storage
## Cleaning Paratimroseite specimens are extremely delicate and typically microscopic in size. Mechanical cleaning is not recommended and can lead to the destruction of brittle crystals. If absolutely necessary, compressed air can be used from a safe distance to remove loose dust particles. ## What to Avoid Avoid contact with all chemicals, including acids and detergents. Do not use ultrasonic cleaners. Specimens should be protected from shocks, scratching, and abrasion. ## Storage The safest way to store specimens is to keep them in their original, sealed "micromount" box, protecting them from dust and mechanical damage. Avoid exposure to extreme temperatures and humidity.