In one paragraphHematoid quartz is clear or milky quartz (SiO2) hosting iron oxide inclusions — hematite (Fe2O3), goethite (FeO(OH)), or limonite (hydrated iron oxide) — that grew before or during the host crystal. The inclusions are protogenetic, meaning they were already present when the quartz crystallised around them. Colours range from rust orange to dusky brick to deep purple-red, depending on which iron mineral is dominant and how oxidised it became.
Hematoid quartz sits in an unusual category: a single piece can show six different colours and three different mineral inclusions, yet the host is always the same boring chemistry — pure silicon dioxide. The drama is entirely in what got trapped inside. The trade name covers everything from a clear quartz with a single rust-coloured cloud to a dense purple-red mass that looks like dried blood frozen in glass.
This guide unpacks what iron mineral is doing what, why colours shift from orange to brick to dusky purple, the relationship between hematoid quartz and the related fire quartz / harlequin quartz trade names, where the visible material on the market is mined, and how to read a strand bead-by-bead before purchase. It also clears up a common confusion: hematoid quartz is not the same as hematite, the standalone iron oxide mineral.
What hematoid quartz actually is
Hematoid quartz is not a separate species — it is macrocrystalline quartz with visible iron oxide inclusions. The host is identical to clear quartz: trigonal SiO2, Mohs 7, refractive index 1.544-1.553. What makes it hematoid is the included mineral, and there are three candidates: hematite (Fe2O3), the metallic black-to-red iron oxide; goethite (α-FeO(OH)), the brown-red hydroxide; and limonite, a field term for a mixture of goethite, lepidocrocite and other hydrated iron oxides usually responsible for the yellow-orange tones.
The inclusions are protogenetic: they formed before the host quartz. As the hydrothermal fluid carrying silica passed through iron-rich fractures, the iron minerals were already there, and the quartz nucleated around them. This makes hematoid quartz mechanically the same as rutilated quartz — different inclusion mineral, identical formation story. Some specimens also contain syngenetic hematite that grew at the same time, recognisable by its sharper, more crystalline edges.
One persistent confusion: hematoid quartz (quartz hosting iron oxide) is not the same as hematite (the iron oxide mineral on its own, dark grey-black with a red streak). The trade sometimes blurs the two; the geology is clear. Hematoid quartz has a glassy quartz lustre. Pure hematite has a metallic to sub-metallic lustre and a much higher specific gravity (5.3 versus 2.65 for quartz).
Why the colour varies
Three variables drive colour in hematoid quartz: which iron mineral is included, how oxidised it is, and how the inclusion is distributed (dust, needle, cloud, or band).
| Variety / colour | Inclusion mineralogy | What it tells you |
|---|---|---|
| Rust orange / golden brown | Limonite or hydrated goethite (FeO(OH) + water) | The most oxidised iron form; the strand has seen long surface weathering before mining |
| Brick red | Hematite (Fe2O3) dust dispersed through the host | Iron-rich fluid passed through during the host's growth; classic Brazilian appearance |
| Dusky purple-red | Dense hematite microflakes that absorb in the green-yellow band | Higher inclusion density; reads more saturated under daylight |
| Black metallic needles in clear host | Specular hematite — flat, crystalline iron oxide platelets | Syngenetic growth (quartz and hematite together); often seen in Madagascan material |
| Golden-brown silky bundles | Goethite needles, sometimes mistaken for rutile | Goethite is slightly softer and more brittle than rutile; the host quartz often clears around the bundles |
| Banded clear / rust / red | Multiple pulses of iron-rich fluid during quartz growth | The bands record the host's growth history; common in Moroccan material |
Where the visible material forms
Hematoid quartz forms anywhere quartz grows in iron-rich hydrothermal conditions — which is a lot of places. Commercial material concentrates where mining of clear quartz also turns up iron-bearing pockets.
| Origin | Typical character | What to look for |
|---|---|---|
| Minas Gerais, Brazil (Diamantina, Corinto) | Brick red to dusky purple-red; the largest source of high-grade material | The classic look: clear-to-milky host with dense hematite dust; saturated colour in low light |
| Madagascar (Antsirabe, Ihosy) | Specular hematite needles in clear or milky host | Visible black needle pattern under a loupe; cleaner background than Brazilian material |
| Morocco (Imilchil, Boudib) | Banded clear and rust-red quartz with goethite bundles | Strong banding within a single bead; striking when sliced perpendicular to growth direction |
| Arkansas, USA (Hot Springs district) | Light rust-orange clouds in otherwise clear quartz | Limonite-included; soft golden tone rather than red; less common in bead market |
| Western Australia (Pilbara region) | Hematite-rich quartz from banded iron formation contacts | Often deep brick red with metallic micaceous flakes; less common in jewellery than as specimen |
Reading a hematoid quartz strand
Because the inclusion patterns vary inside a single mining pocket, hematoid quartz is among the more variable strand stones. Reading one well means looking at host clarity, inclusion distribution, and bead-to-bead consistency together.
- Host transparency. Backlight the strand. A good hematoid quartz shows a clear or lightly veiled quartz host with the iron inclusion suspended in it. A dense opaque rust colour usually means the host is heavily fractured rather than truly clear.
- Inclusion distribution. Look for inclusions inside the bead, not just on the surface. Surface-only iron stains can be removed with acid; internal hematite is part of the structure.
- Colour balance across the strand. Lay the strand flat under daylight. Beads should read at similar saturation; wild jumps from clear-and-orange to dense-red mean offcut blending.
- Inclusion pattern. Loose dust gives a cloud effect; aligned needles give a directional shimmer; sharp platelets give visible metallic flashes. Each is legitimate — the question is whether the pattern matches what the strand is sold as.
- Drill hole inspection. Iron-stained drill holes can mean the bead was acid-bleached and re-stained. Genuine hematoid quartz shows internal inclusions extending continuously past the hole edges, not just at them.
Trade names, decoded
The trade vocabulary around iron-included quartz is unusually rich, and several names overlap in confusing ways.
- Hematoid quartz. The umbrella term — quartz with any iron oxide inclusion (hematite, goethite, limonite). This is the most accurate name.
- Fire quartz. A modern trade name for hematoid quartz with vivid red banding, usually Brazilian. Same mineral as hematoid quartz; the name is descriptive.
- Harlequin quartz. Quartz with small bright red flecks of specular hematite or lepidocrocite scattered through it. Same family; the name highlights the polka-dot pattern.
- Strawberry quartz. Sometimes used for hematoid quartz, sometimes for quartz with red lepidocrocite inclusions. Ask about the inclusion mineralogy; the term is loose.
- Hematite quartz. A redundant term often used in retail. Refers to the same material; avoid in favour of hematoid quartz to prevent confusion with pure hematite.
- Red phantom quartz. Specifically quartz with hematite outlining an earlier growth face inside the crystal — a sub-variety of hematoid quartz with ghost-crystal structure.
Caring for hematoid quartz
Hematoid quartz is as durable as any clear quartz — Mohs 7 in the host — but the iron inclusions are softer (hematite Mohs 5-6, goethite 5-5.5). Avoid acidic cleaners (vinegar, lemon juice) which dissolve surface iron and leave a chalky white halo. Ultrasonic cleaners are usually safe but skip them if you can see internal fractures. Soap, water, and a soft cloth handle daily cleaning. Direct sunlight is fine; iron oxide chromophores are photostable. Store separately from softer strands to avoid surface scratching.
How BE. grades hematoid quartz
Each strand is read against the Crystal 4T framework — Transparency, Tone, Texture and Trace — and ships with the matching Stone Origin Card naming the source country and region (Diamantina, Antsirabe and Imilchil are recurring sources, and where the upstream supplier has disclosed a specific deposit the locality is recorded) and the specific included mineral at the species level (hematite, goethite, or limonite). Tone is read under 5000 K daylight against a graded rust-to-purple-red reference; beads with surface-only iron stains are excluded. Internal inclusion pattern is verified under 10x loupe before strand assembly.
Frequently asked questions
Q1.Is hematoid quartz the same as hematite?
No. Hematite is the standalone iron oxide mineral Fe2O3, dark grey-black with a metallic lustre and a red streak. Hematoid quartz is clear or milky quartz (SiO2) hosting hematite (or goethite, or limonite) as inclusions. Different mineral, different hardness, different appearance.
Q2.What makes hematoid quartz red?
Iron oxide inclusions dispersed through the quartz host. Hematite (Fe2O3) gives brick-red to dusky purple-red tones; goethite (FeO(OH)) gives more orange-brown; limonite gives rust-yellow. The mineral identity and the inclusion density together set the colour.
Q3.Are the iron inclusions natural?
In quality material, yes — the iron minerals are protogenetic, meaning they were already in the host rock when the quartz grew around them. Acid-stained imitations exist; these can be spotted because the stain concentrates at fractures and drill holes rather than running continuously through the bead.
Q4.What is the difference between hematoid quartz, fire quartz, and harlequin quartz?
All three are quartz with iron oxide inclusions. Hematoid quartz is the broad term. Fire quartz usually refers to densely banded red varieties from Brazil. Harlequin quartz refers to specimens with small bright red flecks scattered like polka dots. The geology is essentially the same; the names highlight different visual patterns.
Q5.Can hematoid quartz be confused with rutilated quartz?
Yes, especially when the inclusions are goethite needles — these can resemble rutile needles. Under a loupe, rutile needles are usually sharper, more golden, and harder to scratch. Goethite is softer, more brittle, and slightly browner. A gemmologist can separate them definitively with a refractometer.
Q6.Does hematoid quartz fade?
No. Iron oxide chromophores are photostable. You can wear hematoid quartz outdoors indefinitely without colour loss. The only environmental concern is acidic cleaning agents, which dissolve surface iron and leave a whitened halo.
References
- Mindat — Hematite data
- Mindat — Quartz data
- GIA Gems & Gemology — Iron-included quartz
- Wikipedia — Hematite
- Wikipedia — Goethite
- Webster, R. (2002). Gems: Their Sources, Descriptions and Identification, 5th ed. Butterworth-Heinemann.
- Schumann, W. (2009). Gemstones of the World, 4th ed. Sterling.
- BE. — Our Story — the brand's geology-first founding stance.
- BE. Crystal 4T Grading System — the four observable axes used to read a strand.
- BE. Geological Codex — material-level reference for the stones in the BE. catalogue.
Share:
Crystal Grids: Sacred Geometry, Patterns & Practical Use
You Don’t Need a Crystal to Fix You