Lithify: Geology Field Guide
iOS app by Shadowfetch · App Store ID 6792598886 · iOS
Lithify is a serious, offline field guide for rockhounds, geology students, prospectors and hikers. It pairs a genuine identification engine with a richly illustrated reference library of 101 rocks and minerals — all on your device, with no account, no subscription, and no photos leaving your phone.
Most rock-ID apps upload your pictures to a cloud service and hide the answer behind a subscription. Lithify takes the opposite approach: it teaches you to identify a specimen the way a geologist does — by its diagnostic properties — and shows its work every step of the way.
Identify, Honestly
- Dichotomous Key — an adaptive question-and-answer key that starts from luster, hardness and streak and narrows the field with each answer, showing the live candidate count so you always know where you stand.
- Property Matcher — enter whatever you observed (hardness band, streak color, cleavage, magnetism, acid reaction, color) and get a ranked shortlist scored by how well each specimen agrees. Partial information still helps.
- Photo Color Assist — sample a photo's dominant colors on-device to suggest color-consistent candidates. It is an aid, never an automatic verdict — and it is honest about that.
A Real Reference Library
- 69 minerals and 32 rocks (igneous, sedimentary, metamorphic), each with a curated photo gallery.
- Factual structured properties: Mohs hardness, streak, luster, cleavage, fracture, specific gravity, crystal system, chemical formula, diaphaneity, tenacity, magnetism and acid reaction.
- Classification by mineral group plus Dana and Strunz numbers.
- Formation environments, notable localities, common uses, and field-identification tips for every entry.
- Search and filter by type, rock class, hardness band, and color.
Field Tools
- Mohs Scale — the ten index minerals, common field-test tools (fingernail, copper coin, steel, glass), and how to run a proper scratch test.
- Specific Gravity Calculator — compute SG by the hydrostatic (Archimedes) method or mass ÷ volume, then match your result against minerals of that density. Real physics, not a lookup.
- Test Reference — how to read streak, luster, cleavage versus fracture, and the acid test.
Your Collection
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Lithify: Geology Field Guide · App Store ID 6792598886 · Published by Shadowfetch · shadowfetch.com