Stone & Ground
What the land is made of — minerals, rock, and the ground you build on.
Key
subtitle = formula / landform type
Minerals
Barite
BaSO₄ — barium sulfate
The namesake. A surprisingly heavy white-to-tan mineral, mined across Mohave County and used as drilling mud weight. Pick up a chunk and the density gives it away instantly — this is the 'Barito' in Barito Bajada.
Quartz
SiO₂ — silica
The white vein rock scattered across the whole desert. Hardest common mineral here — it survives while softer rock weathers to sand around it.
Feldspar
Pink grains in granite
The pink crystal you see studded through granite. As it weathers it breaks down into clay — the source of the fine, sticky fraction in your soil.
Mica
Flaky, shiny flecks
The glittering flakes in decomposed granite that catch the sun. Not gold — it's soft enough to scratch with a fingernail and peels in sheets.
Gypsum
CaSO₄·2H₂O — soft white
A soft white mineral — and the practical soil amendment for breaking up tight caliche-clay ground without changing pH. Worth knowing when you're trying to make hardpan plantable.
Rock Types
Granite & decomposed granite
Igneous — the ranges & the 'DG'
The bones of the surrounding mountains, slowly crumbling into the gravel underfoot. Decomposed granite ('DG') compacts into a hard, cheap surface — your default for driveway, pads, and paths.
Basalt
Dark volcanic rock
Heavy dark lava rock from nearby flows. Dense and slow to heat or cool — useful as thermal mass around the walipini or a fire pit, where you want stored warmth.
Volcanic cinder / scoria
Red, porous — 'lava rock'
Lightweight red rock full of gas holes. Cheap and locally available; great for paths, French-drain fill, and drainage layers where you don't want it holding water.
Ground & Crust
Caliche
CaCO₃ hardpan layer
A cemented calcium-carbonate layer that can stop a shovel cold and ring like concrete. It also blocks drainage, so plant roots and septic both have to get through or around it — the single biggest surprise on most desert digs. Expect it; plan for a breaker bar or rented machine.
Desert pavement
Gravel-armored surface
That tight mosaic of close-packed pebbles is a natural armor built over centuries, protecting fine soil beneath from wind and rain. Break it with tires or grading and you expose erodible dust — disturb it deliberately, not casually.
Desert varnish
Manganese / iron coating
The dark, almost polished sheen on long-exposed rock faces — a microbial coating that takes thousands of years to form. It's the canvas ancient peoples scratched petroglyphs into; if you find marked rock, leave it and note it.
Landforms
Bajada
Coalesced alluvial slope
The broad apron of debris that washes off the mountains and merges into one long gentle slope — the landform your parcel sits on. Good drainage, deep loose soil, and the reason water moves the way it does across your land. This is the 'Bajada' in Barito Bajada.
Wash / arroyo
Dry channel — flash-flood path
A sandy channel that's bone-dry 360 days a year and a violent torrent the other five. Rain falling on a mountain miles away fills it with no warning — never build, park, camp, or store anything in one, and route your structures and drives clear of it.
Playa
Dry-lake silt flat
Flat alkaline beds of fine silt that briefly flood, then dry and crack into tiles. A major dust source on windy days and too salty/sticky to build or grow on — useful to recognize, not to use.
