Building a high-end mineral collection requires understanding what makes a specimen truly exceptional. At Astro West, we evaluate these qualities when selecting our fine minerals and advise you to do the same when building your personal collection:

• Crystal Form – The sharpness and symmetry of crystal faces set the finest pieces apart. Perfectly defined edges and natural geometry reveal ideal growth conditions and make a specimen highly desirable. Astro West’s Natural Pyrite Cubes on Matrix From Spain are a prime example of the kind of crystal formations that are sought after by collectors.
• Color – Pure, intense color is a hallmark of value. When paired with good transparency, vibrant hues create striking aesthetic appeal. On matrix, complementary or contrasting colors between species can further enhance a specimen’s overall beauty.
• Transparency – Water-clear crystals with flawless interiors are rare and command top attention.
  Even partial transparency can greatly elevate a specimen’s brilliance and depth.
• Luster – Bright, reflective surfaces highlight a mineral’s quality. The smoother and more perfect the surface, the stronger the luster, lending a specimen an unmistakable glow.
  Size – Large specimens can be impressive, but quality comes first. Many of the world’s most prized minerals are small, flawless crystals with no defects.