Specimen index
Minerals are naturally occurring inorganic solids with a set chemistry and crystal structure. Stones — rocks — are aggregates of one or more minerals. Every piece below carries an index number.
GG-S01 · Silicates
Pink elbaite crystal with dark mica flakes
Pink-to-red elbaite. Faint green at the tip shows colour zoning. Final colour grade pending founder review.
GG-S02 · Silicates
Bi-colour elbaite — pink core, green rind
Sliced across the c-axis, the zoning looks like a watermelon. Field photos from our own parcels; the cross-section is a reference image.
GG-S03 · Silicates
Dark green prismatic crystals
Long striated prisms — near-black along the length, vivid green through the side.
GG-S04 · Silicates
Pink & green elbaite in quartz–feldspar
A rock, not a single mineral: tourmaline locked in white quartz and feldspar.
GG-S05 · Silicates
Emerald-cut (step-cut) gemstone
Rough to finished stone: step-cut for clean, saturated green.
GG-S06 · Silicates
Oval faceted gem in silver halo setting
Pale lilac colour fits kunzite or light amethyst — identity pending gem-lab report. Not sold as either until confirmed.
GG-S08 · Silicates
Mixed parcel, sorted for buyers
Bulk parcels graded by colour and clarity for export.
GG-S09 · Silicates
Blue-green elbaite prism
The rarest tourmaline colour. Deep sea-blue down the length of the crystal.
GG-S10 · Silicates
Lilac gem-grade crystal blade
Shown in hand at the sorting table. Strong cleavage — cut by experienced lapidaries only.
GG-S11 · Silicates
Massive lilac lithium mica
Boulder in the field and ore stockpile. A lithium and rubidium source.
GG-S12 · Silicates
Sky-blue beryl rough parcel
Clean blue rough sorted for cutting.
GG-S13 · Silicates
Small prismatic gem rough, warm colours
Peach-to-honey crystals with a few pink and bi-colour pieces. Exact species pending gem-lab report.
GG-S14 · Silicates
Facet-grade rough and water-worn pebbles
Vivid purple to neon-magenta rough. Shown as found; species confirmed per stone by gem lab before sale.
GG-S15 · Silicates
Mixed river-worn gem pebbles
How many gems are first found — tumbled smooth by water. Sorted by colour before grading.
GG-S16 · Silicates
Quartz with red iron-oxide inclusions
Quartz coloured red by hematite trapped as it grew.
GG-S17 · Silicates
Cognac cushion & pink pear cuts
Finished stones from our own rough. Each stone goes with a lab report before sale.
GG-N01 · Native Elements
Alluvial gold nugget, from the field
Recovered on site — native gold, malleable and untarnished.
GG-O01 · Oxides
Tin ore
Historic Jos Plateau tin-field mineral. Reference photo.
GG-O02 · Oxides
Coltan
Critical mineral. Reference photo.
GG-N02 · Native Elements
Native silver wire
Reference photo — illustrative museum specimen.
GG-N03 · Native Elements
Native copper dendrite
Reference photo — illustrative museum specimen.
GG-N04 · Native Elements
Rough octahedral crystal in kimberlite
Reference photo — illustrative specimen, not from our stock.
GG-O03 · Oxides
Specular iron ore
Main iron ore — red-brown streak. Reference photo.
GG-O04 · Oxides
Octahedral iron oxide
Strongly magnetic iron ore. Reference photo.
GG-O05 · Oxides
Titanium dioxide prisms
Titanium ore. Reference photo.
GG-SU1 · Sulfides & Sulfates
Lead ore
Benue Trough lead–zinc belt. Reference photo.
GG-C01 · Carbonates
Industrial carbonate
Cement and construction feedstock. Reference photo.
Classification
Silicon + oxygen. Over 90% of Earth's crust.
Quartz, Feldspar, Mica, Tourmaline, Lepidolite
Carbon + oxygen.
Calcite
Salts of halogen elements.
Halite
Oxygen bonded to a metal.
Hematite, Magnetite, Cassiterite
Contain sulfur.
Pyrite, Galena, Gypsum
A single element.
Gold, Silver, Copper, Diamond
Cooled from magma or lava.
Granite, Basalt, Pumice — and the pegmatites that host our tourmaline.
Particles accumulated and compressed in layers.
Sandstone, Limestone, Shale.
Transformed by heat and pressure without melting.
Marble from limestone, Slate from shale.
