Feldspar Group
Sunstone
Sunstone's sparkly orange-red glitter comes from a genuinely different mechanism than labradorite's flash or moonstone's glow, even though all three are feldspars: sunstone's effect, called schiller, comes from thin, flat platelets of actual metal — usually native copper, occasionally hematite — embedded within the crystal, reflecting light off discrete metallic surfaces rather than the light-interference layering that produces its feldspar cousins' effects. Oregon's native sunstone deposit is unusual worldwide for containing genuine copper inclusions rather than the hematite more commonly responsible for schiller elsewhere.
The geology — what Sunstone actually is
- Mineral class
- Silicate (feldspar group — an oligoclase/labradorite-series variety carrying metallic platelet inclusions)
- Chemical formula
- (Na,Ca)(Al,Si)4O8 feldspar host with copper or hematite platelet inclusions
- Crystal system
- Triclinic
- Mohs hardness
- 6 to 6.5
What causes the color: The sparkly schiller effect comes from thin, flat platelets of native copper (in Oregon material) or hematite (more common elsewhere) included within the feldspar, reflecting light at specific angles as discrete metallic glints — a fundamentally different optical mechanism from labradorite's light-interference flash or moonstone's diffuse adularescence, even though all three effects loosely fall under the same broad 'feldspar schiller' family.
How it forms: Forms in igneous rocks — particular volcanic and plutonic feldspar-bearing formations — where copper- or hematite-rich fluid deposited thin metallic platelet inclusions within the feldspar as it crystallized.
- Oregon, USA (the official state gemstone, found in basalt and unusual for containing genuine copper rather than hematite inclusions)
- Norway (the historical source tied to the original 'sunstone' name)
- India
- Tanzania
Treatments & imitations: Generally untreated, though some material is heat- or diffusion-treated to enhance the visibility of copper schiller. Sometimes confused with man-made goldstone glass, a completely different material embedded with synthetic copper crystals to mimic a similar sparkle.
Real vs. fake: Genuine sunstone's sparkle comes from discrete, flat metallic platelets visible as individual glints under magnification that shift position distinctly as the stone tilts, distinguishable from goldstone's much more uniform, evenly-distributed man-made glass sparkle. Genuine sunstone also shows true feldspar cleavage, a structural property glass entirely lacks.
The tradition — how people use Sunstone
Historical use: Oregon sunstone was used decoratively by Native American peoples in the region well before its modern commercial mining began. Separately, Scandinavian legend describes a Viking navigational 'sunstone' used to locate the sun's position through overcast skies at sea — though mineralogists and historians disagree on whether that legendary stone was actually this feldspar or a different mineral, cordierite, which has documented light-polarizing properties useful for that specific navigational purpose; this site notes that uncertainty honestly rather than presenting the Viking legend as confirmed history of the gem sold as sunstone today.
Metaphysical tradition: Warmth, vitality, and leadership are the qualities sunstone carries at the sacral and solar plexus chakras in modern crystal-healing tradition, drawing on its bright, sun-associated coloring and sparkle.
How to use it: Frequently worn as jewelry, or carried in the belief it supports vitality and confidence, especially before physically or socially demanding situations.
Cleansing & care: Durable (Mohs 6-6.5) but shares the feldspar family's cleavage planes, so a sharp knock can still chip it despite reasonable hardness — handle firm impacts carefully, and a brief rinse with water is otherwise safe.
Frequently asked questions
Why is Oregon sunstone specifically prized over material from other localities?
It's the one commercial source producing genuine native-copper inclusions rather than the hematite platelets responsible for schiller almost everywhere else sunstone is found, and that copper produces a noticeably more vivid red-to-green color-shifting effect (sometimes marketed as 'Oregon sunstone' specifically to distinguish it) than hematite-bearing material typically shows from India or Tanzania.
Is sunstone the same as goldstone?
No — goldstone is man-made glass embedded with synthetic copper crystals, not a natural mineral at all, while sunstone is a genuine feldspar with naturally-occurring metallic inclusions. The two can look superficially similar, which leads to occasional confusion in casual marketing.
Why does cordierite fit the Viking navigation legend better than gem sunstone does?
Cordierite (sometimes traded as iolite) shows strong pleochroism — it changes visible color depending on viewing angle relative to polarized skylight — which would genuinely help locate the sun's position through thin cloud cover in a way feldspar sunstone's metallic schiller sparkle has no comparable optical basis for doing. That's the specific reason most researchers investigating the legend lean toward cordierite as the more physically plausible candidate, even though the historical Old Norse texts don't specify a mineral precisely enough to settle the question definitively.
Related crystals
Labradorite
Feldspar Group
Labradorite is a plagioclase feldspar whose grey, unremarkable-looking base hides a striking optical trick: tilt it and flashes of electric blue, green, gold, or orange sweep across the surface, an effect called labradorescence. That flash comes from the same broad family of phenomena as moonstone's softer glow, but on a coarser internal scale, which is why labradorite produces sharp, switching color flashes instead of a diffuse shimmer. The stone was first described to Western science in 1770 by Moravian missionaries in Labrador, Canada, who learned of it from Inuit communities already using it.
Carnelian
Chalcedony Family
Carnelian is the orange-to-red-brown variety of chalcedony, itself a microcrystalline (fine-grained, fibrous) form of quartz rather than the large single crystals typical of amethyst or clear quartz — which is why carnelian breaks with a smooth, waxy fracture instead of the sharper cleavage you'd see in coarser quartz. It's also one of the oldest gemstones in continuous documented human use, worn as protective amulets in Egypt more than 4,000 years ago.
Citrine
Quartz Family
Citrine is the yellow-to-orange variety of quartz, and here's the fact that surprises most buyers: genuinely natural citrine — colored that way by nature, never heated — is rare, while the vast majority of citrine sold commercially is amethyst or smoky quartz that's been heat-treated to shift its color. Both are real quartz with a real color change, but only one occurred without human intervention, and reputable sellers should be able to tell you which you're buying.
Moonstone
Feldspar Group
Moonstone is a variety of feldspar — specifically orthoclase or, in the finest material, adularia — and the soft, floating blue-white glow it's named for (called adularescence) isn't a surface coating or dye at all: it's an optical effect caused by light scattering off microscopically thin, alternating layers of two different feldspar minerals that separated inside the crystal as it cooled slowly underground, a process mineralogists call exsolution.
Where to buy Sunstone
We don't have an active affiliate program live yet, so instead of a placeholder link, here's the same buying guidance we'd give a friend.
Specialty mineral dealers & gem shows
The most reliable source for anything beyond common tumbled stones — sellers who specialize in minerals tend to disclose treatments and localities unprompted, because their repeat customers ask.
GIA/AGS-affiliated jewelers
For cut gemstones meant for jewelry (not raw specimens), a seller who can produce or reference an independent lab report (GIA, AGS) removes almost all of the real-vs-fake guesswork.
Marketplace sellers with a track record
Etsy and similar marketplaces host genuine small mineral dealers alongside mislabeled resin castings — check seller reviews specifically for photos of received items, not just star ratings.
Local rock & gem shops
Being able to handle a piece before buying lets you apply the weight and hardness checks described on each stone's own page — something no photo can substitute for.
Whichever seller you choose, ask directly whether the stone is natural or synthetic, and whether it's been treated (heated, dyed, irradiated) — a straightforward answer is the single best signal of a trustworthy seller, more useful than any star rating.
Some links on this page are affiliate links — if you buy through them, GemGlow may earn a small commission at no extra cost to you. We only link to sellers we'd genuinely recommend.
Sources and factual basis for the geology above: see our methodology.